doc: Add historical release notes for 0.10.4 0.11.2 and 0.12.0

doc/release-notes/release-notes-0.10.4.md

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+Bitcoin Core version 0.10.4 is now available from:
+
+  <https://bitcoin.org/bin/bitcoin-core-0.10.4/>
+
+This is a new minor version release, bringing bug fixes, the BIP65
+(CLTV) consensus change, and relay policy preparation for BIP113. It is
+recommended to upgrade to this version as soon as possible.
+
+Please report bugs using the issue tracker at github:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+Upgrading and downgrading
+=========================
+
+How to Upgrade
+--------------
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the
+installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or
+bitcoind/bitcoin-qt (on Linux).
+
+Downgrade warning
+------------------
+
+Because release 0.10.0 and later makes use of headers-first synchronization and
+parallel block download (see further), the block files and databases are not
+backwards-compatible with pre-0.10 versions of Bitcoin Core or other software:
+
+* Blocks will be stored on disk out of order (in the order they are
+received, really), which makes it incompatible with some tools or
+other programs. Reindexing using earlier versions will also not work
+anymore as a result of this.
+
+* The block index database will now hold headers for which no block is
+stored on disk, which earlier versions won't support.
+
+If you want to be able to downgrade smoothly, make a backup of your entire data
+directory. Without this your node will need start syncing (or importing from
+bootstrap.dat) anew afterwards. It is possible that the data from a completely
+synchronised 0.10 node may be usable in older versions as-is, but this is not
+supported and may break as soon as the older version attempts to reindex.
+
+This does not affect wallet forward or backward compatibility. There are no
+known problems when downgrading from 0.11.x to 0.10.x.
+
+Notable changes since 0.10.3
+============================
+
+BIP65 soft fork to enforce OP_CHECKLOCKTIMEVERIFY opcode
+--------------------------------------------------------
+
+This release includes several changes related to the [BIP65][] soft fork
+which redefines the existing OP_NOP2 opcode as OP_CHECKLOCKTIMEVERIFY
+(CLTV) so that a transaction output can be made unspendable until a
+specified point in the future.
+
+1. This release will only relay and mine transactions spending a CLTV
+   output if they comply with the BIP65 rules as provided in code.
+
+2. This release will produce version 4 blocks by default. Please see the
+   *notice to miners* below.
+
+3. Once 951 out of a sequence of 1,001 blocks on the local node's best block
+   chain contain version 4 (or higher) blocks, this release will no
+   longer accept new version 3 blocks and it will only accept version 4
+   blocks if they comply with the BIP65 rules for CLTV.
+
+For more information about the soft-forking change, please see
+<https://github.com/bitcoin/bitcoin/pull/6351>
+
+Graphs showing the progress towards block version 4 adoption may be
+found at the URLs below:
+
+- Block versions over the last 50,000 blocks as progress towards BIP65
+  consensus enforcement: <http://bitcoin.sipa.be/ver-50k.png>
+
+- Block versions over the last 2,000 blocks showing the days to the
+  earliest possible BIP65 consensus-enforced block: <http://bitcoin.sipa.be/ver-2k.png>
+
+**Notice to miners:** Bitcoin Core’s block templates are now for
+version 4 blocks only, and any mining software relying on its
+getblocktemplate must be updated in parallel to use libblkmaker either
+version FIXME or any version from FIXME onward.
+
+- If you are solo mining, this will affect you the moment you upgrade
+  Bitcoin Core, which must be done prior to BIP65 achieving its 951/1001
+  status.
+
+- If you are mining with the stratum mining protocol: this does not
+  affect you.
+
+- If you are mining with the getblocktemplate protocol to a pool: this
+  will affect you at the pool operator’s discretion, which must be no
+  later than BIP65 achieving its 951/1001 status.
+
+[BIP65]: https://github.com/bitcoin/bips/blob/master/bip-0065.mediawiki
+
+Windows bug fix for corrupted UTXO database on unclean shutdowns
+----------------------------------------------------------------
+
+Several Windows users reported that they often need to reindex the
+entire blockchain after an unclean shutdown of Bitcoin Core on Windows
+(or an unclean shutdown of Windows itself). Although unclean shutdowns
+remain unsafe, this release no longer relies on memory-mapped files for
+the UTXO database, which significantly reduced the frequency of unclean
+shutdowns leading to required reindexes during testing.
+
+For more information, see: <https://github.com/bitcoin/bitcoin/pull/6917>
+
+Other fixes for database corruption on Windows are expected in the
+next major release.
+
+0.10.4 Change log
+=================
+
+Detailed release notes follow. This overview includes changes that affect
+behavior, not code moves, refactors and string updates. For convenience in locating
+the code changes and accompanying discussion, both the pull request and
+git merge commit are mentioned.
+
+- #6953 `8b3311f` alias -h for --help
+- #6953 `97546fc` Change URLs to https in debian/control
+- #6953 `38671bf` Update debian/changelog and slight tweak to debian/control
+- #6953 `256321e` Correct spelling mistakes in doc folder
+- #6953 `eae0350` Clarification of unit test build instructions
+- #6953 `90897ab` Update bluematt-key, the old one is long-since revoked
+- #6953 `a2f2fb6` build: disable -Wself-assign
+- #6953 `cf67d8b` Bugfix: Allow mining on top of old tip blocks for testnet (fixes testnet-in-a-box use case)
+- #6953 `b3964e3` Drop "with minimal dependencies" from description
+- #6953 `43c2789` Split bitcoin-tx into its own package
+- #6953 `dfe0d4d` Include bitcoin-tx binary on Debian/Ubuntu
+- #6953 `612efe8` [Qt] Raise debug window when requested
+- #6953 `3ad96bd` Fix locking in GetTransaction
+- #6953 `9c81005` Fix spelling of Qt
+- #6946 `94b67e5` Update LevelDB
+- #6706 `5dc72f8` CLTV: Add more tests to improve coverage
+- #6706 `6a1343b` Add RPC tests for the CHECKLOCKTIMEVERIFY (BIP65) soft-fork
+- #6706 `4137248` Add CHECKLOCKTIMEVERIFY (BIP65) soft-fork logic
+- #6706 `0e01d0f` Enable CHECKLOCKTIMEVERIFY as a standard script verify flag
+- #6706 `6d01325` Replace NOP2 with CHECKLOCKTIMEVERIFY (BIP65)
+- #6706 `750d54f` Move LOCKTIME_THRESHOLD to src/script/script.h
+- #6706 `6897468` Make CScriptNum() take nMaxNumSize as an argument
+- #6867 `5297194` Set TCP_NODELAY on P2P sockets
+- #6836 `fb818b6` Bring historical release notes up to date
+- #6852 `0b3fd07` build: make sure OpenSSL heeds noexecstack
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Alex Morcos
+- Daniel Cousens
+- Diego Viola
+- Eric Lombrozo
+- Esteban Ordano
+- Gregory Maxwell
+- Luke Dashjr
+- MarcoFalke
+- Matt Corallo
+- Micha
+- Mitchell Cash
+- Peter Todd
+- Pieter Wuille
+- Wladimir J. van der Laan
+- Zak Wilcox
+
+And those who contributed additional code review and/or security research.
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).