Add release notes for 1.0.0-beta1.

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+Daira Hopwood (1):
+      Update steps after D
+
+Jack Grigg (43):
+      Undo debugging change from 5be6abbf84c46e8fc4c8ef9be987a44de22d0d05
+      Output Equihash solution in RPC results as a hex string
+      Add optional bool to disable computation of proof in JSDescription constructor
+      Add wallet method for finding spendable notes in a CTransaction
+      Store mapping between notes and PaymentAddresses in CWalletTx
+      Keep track of spent notes, and detect and report conflicts
+      Create mapping from nullifiers to received notes
+      Add caching of incremental witnesses for spendable notes
+      Update cached incremental witnesses when the active block chain tip changes
+      Test solution output of blockToJSON()
+      Pass ZCIncrementalMerkleTree to wallet to prevent race conditions
+      Remove GetNoteDecryptors(), lock inside FindMyNotes() instead
+      Replace vAnchorCache with a cache size counter
+      mapNullifiers -> mapNullifiersToNotes for clarity
+      Set witness cache size equal to coinbase maturity duration
+      Add transactions to wallet if we spend notes in them
+      Add test for GetNoteDecryptor()
+      Keep any existing cached witnesses when updating transactions
+      Changes after review
+      Add test showing that the witness cache isn't being serialised
+      Fix the failing test!
+      Increase coverage of GetNoteDecryptor()
+      Add coverage of the assertion inside GetNoteWitnesses()
+      Separate concepts of block difficulty and network difficulty in RPC
+      Add test comparing GetDifficulty() with GetNetworkDifficulty()
+      Remove mainnet DNS seeds, set checkpoint to genesis
+      Fix failing test
+      Adjust from average difficulty instead of previous difficulty
+      Remove testnet-only difficulty rules
+      Add comments explaining changed semantics of pow_tests
+      Expand bounds on difficulty adjustment
+      Remove accidental double-semicolon (harmless but odd)
+      Add test of difficulty averaging
+      Simplify difficulty averaging code
+      Restrict powLimit due to difficulty averaging
+      Regenerate genesis blocks for new powLimits
+      Update tests for new genesis blocks
+      Adjust test to avoid spurious failures
+      Remove unnecessary method
+      Adjust test to account for integer division precision loss
+      Refactor wallet note code for testing
+      Add tests for refactored wallet code
+      Remove .z# suffix from version
+
+Lars-Magnus Skog (1):
+      changed module name from "bitcoin" to "Zcash" in FormatException()
+
+Sean Bowe (7):
+      Deallocate the public parameters during Shutdown.
+      Update libsnark again.
+      Fix CheckTransaction bugs.
+      Remove TODO 808.
+      Fix transaction test in test_bitcoin.
+      Change version to 1.0.0. This is just a beta.
+      Update pchMessageStart and add testnet DNS boostrapper.
+
+Simon (91):
+      Implemented RPC calls z_importkey, z_exportkey, z_getnewaddress. Modified RPC calls dumpwallet and importwallet to include spending keys.
+      Add z_importwallet and z_exportwallet to handle keys for both taddr and zaddr.  Restore behaviour of dumpwallet and importwallet to only handle taddr.
+      Implemented z_listaddresses to return all the zaddr in the wallet.
+      Add gtest to cover new methods in: CWallet - GenerateNewZKey() - AddZKey() - LoadZKey() - LoadZKeyMetadata() CWalletDB - WriteZKey()
+      Don't mark wallet as dirty if key already exists. Fix incorrect method name used in error message.
+      Added wallet rpc tests to cover: z_importwallet, z_exportwallet z_importkey, z_exportkey z_listaddresses
+      Add test coverage for RPC call z_getnewaddress.
+      Fix comment.
+      Remove one line of dead code.
+      Add "zkey" to list of key types (used by the wallet to decide whether or not it can be recovered if it detects bad records).
+      Fix comments.
+      Rename methods to avoid using prefix of _ underscore which is reserved. Added logging of explicit exception rather than a catch all. Removed redundant spending key check. Updated user facing help message.
+      Fixes #1122 where json_spirit could stack overflow because there was no maximum limit set on the number of nested compound elements.
+      Throw a domain error as json_spirit is a third-party library.
+      Closes #1315.  RPC getblocksubsidy height parameter is now optional and a test has been added to verify parameter input and results.
+      Remove #1144 from transaction.h.
+      Remove #1144 from transaction.cpp by reverting back to commit 942bc46.
+      Remove #1144 from bloom_tests by reverting to commit 5012190.
+      Remove #1144 from input data of script_tests.
+      Update txid gtest to verify #1144 has been removed: GetTxid() and GetHash() return the same result.
+      Refactor: replace calls to GetTxid() with GetHash()
+      Remove GetTxid() from CTransaction and update test_txid
+      Replace GetTxid() with GetHash() after rebase on latest.
+      Add async RPC queue and operation classes. Add z_getoperationstatus RPC command. Add z_sendmany RPC command (dummy implementation, does not send actual coins).
+      Add prefix to async operation id so it is easier to manage on cli.
+      Add config option 'rpcasyncthreads' to specify number of async rpc workers. Default is 1.
+      Add public field 'memo' to JSOutput to enable creation of notes with custom memos.
+      Implement z_sendmany RPC call.
+      Update find_unspent_notes() as mapNoteAddrs_t has been replaced by mapNoteData_t.
+      z_sendmany from a taddr now routes change to a new address instead of back to the sender's taddr,
+      Successful result of z_sendmany returns txid so it doesn't need to return raw hex.
+      Add public method to get state as a human readable string from an AsyncRPCOperation.
+      Add public method to AsycnRPCQueue to retrieve all the known operation ids.
+      Implement RPC call z_listoperationids and update z_getoperationstatus to take a list parameter.
+      Refactoring and small improvements to async rpc operations.
+      Closes #1293 by adding z_getoperationresult and making z_getoperationstatus idempotent.
+      Add chaining of JoinSplits within a transaction.
+      Disable option to allow multiple async rpc workers.
+      Coinbase utxos can only be spent when sending to a single zaddr. Change from the transaction will be sent to the same zaddr.
+      Fix bug where call to sign and send a transaction was in wrong scope.
+      Added option to close a queue and wait for queued up operations to finish, rather than just closing a queue and immediately cancelling all operations.
+      Fix bug where wallet was not persisting witnesses to disk. Author: str4d
+      Refactor to use wallet note tracking from commit a72379
+      Clear the operation queue when closing it.
+      Add test for AsyncRPCQueue and AsyncRPCOperation.
+      Add shared queue to AsynRPCQueue.
+      Update RPCServer to use AsyncRPCQueue's shared queue.
+      Remove redundant check when getting spending key for a payment address.
+      Add tests for async queue and rpc commands: z_getoperationstatus, z_getoperationresult, z_listoperationids, z_sendmany
+      Remove redundant call.
+      Add logging under the category "asyncrpc".
+      Add extra checking of memo data in hexadecimal string format.
+      Add friend class for testing private members of AsyncRPCOperation_sendmany.
+      Add z_getbalance and z_gettotalbalance RPC calls to close #1201.
+      Fix typo in error message
+      Disable proof generation when testmode is enabled in async SendMany operation.
+      Reduce use of global pzcashParams with private member variable
+      Revert "Reduce use of global pzcashParams with private member variable"
+      Replace zcashParams_ with global.
+      Add tests to try and improve coverage of perform_joinsplit.
+      Add GetUnspentNotes to wallet.
+      Add test for GetUnspentNotes() in wallet.
+      Refactor async sendmany and getbalance calls to use GetUnspentNotes().
+      Add more logging.
+      Disable z_sendmany in safe mode
+      Rename GetUnspentNotes to GetFilteredNotes
+      Add z_listreceivedbyaddress RPC call
+      Add 'DEPRECATED' to help message of zcraw* commands
+      Update formatting and documentation.
+      Move lock guard to start of addOperation to protect isClosed() and isFinishing()
+      Fix formatting
+      Add lock guard to getNumberOfWorkers()
+      Replace unique_lock with lock_guard, where appropriate, for consistency
+      Add extra RPC parameter checks for minconf<0 and zaddr not belonging to wallet.
+      Add test for calling RPC z_getbalance, z_gettotalbalance, z_listreceivedbyaddress with invalid parameters.
+      Fix formatting
+      Update log statement to include fee.
+      Fix incorrect default value for argument of GetFilteredNotes.
+      Formatting and updated test per review.
+      Add lock for member variables. Clean up and clarify that id_ and creation_time_ are never to be mutated anywhere. Fix incomplete copy/assignment constructors.
+      Remove unused varible.
+      Add ticket number to issues raised in comment.
+      Add assert for two mutually exclusive member variables.
+      Improve error reporting when attempting to spend coinbase utxos.
+      Use zcash constants
+      Fix formatting
+      Add assert
+      Update comment with ticket issue number
+      Remove line of commented out code we don't need
+      Improve check that user supplied memo field is too long.
+      Replace GetTxid() with GetHash()
+      Update payment-api.md
+      Update security-warnings.md about REST interface
+      Update payment API documentation for beta 1
+
+Taylor Hornby (2):
+      Add -Wformat -Wformat-security
+      Use -Wformat in the test for -Wformat-security