forward-port the 0.2.6.4-0rc changelog

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-Changes in version 0.2.6.4-?? - 2015-0?-??
+Changes in version 0.2.6.4-rc - 2015-03-09
+  Tor 0.2.6.4-alpha fixes an issue in the directory code that an
+  attacker might be able to use in order to crash certain Tor
+  directories. It also resolves some minor issues left over from, or
+  introduced in, Tor 0.2.6.3-alpha or earlier.
+
+  o Major bugfixes (crash, OSX, security):
+    - Fix a remote denial-of-service opportunity caused by a bug in
+      OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
+      in OSX 10.9.
+
+  o Major bugfixes (relay, stability, possible security):
+    - Fix a bug that could lead to a relay crashing with an assertion
+      failure if a buffer of exactly the wrong layout is passed to
+      buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
+      0.2.0.10-alpha. Patch from "cypherpunks".
+    - Do not assert if the 'data' pointer on a buffer is advanced to the
+      very end of the buffer; log a BUG message instead. Only assert if
+      it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
+
+  o Major bugfixes (FreeBSD IPFW transparent proxy):
+    - Fix address detection with FreeBSD transparent proxies, when
+      "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
+      on 0.2.5.4-alpha.
+
+  o Major bugfixes (Linux seccomp2 sandbox):
+    - Pass IPPROTO_TCP rather than 0 to socket(), so that the Linux
+      seccomp2 sandbox doesn't fail. Fixes bug 14989; bugfix
+      on 0.2.6.3-alpha.
+    - Allow AF_UNIX hidden services to be used with the seccomp2
+      sandbox. Fixes bug 15003; bugfix on 0.2.6.3-alpha.
+    - Upon receiving sighup with the seccomp2 sandbox enabled, do not
+      crash during attempts to call wait4. Fixes bug 15088; bugfix on
+      0.2.5.1-alpha. Patch from "sanic".
+
+  o Minor features (controller):
+    - Messages about problems in the bootstrap process now include
+      information about the server we were trying to connect to when we
+      noticed the problem. Closes ticket 15006.
+
+  o Minor features (geoip):
+    - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
+    - Update geoip6 to the March 3 2015 Maxmind GeoLite2
+      Country database.
+
+  o Minor features (logs):
+    - Quiet some log messages in the heartbeat and at startup. Closes
+      ticket 14950.
 
+  o Minor bugfixes (certificate handling):
+    - If an authority operator accidentally makes a signing certificate
+      with a future publication time, do not discard its real signing
+      certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
+    - Remove any old authority certificates that have been superseded
+      for at least two days. Previously, we would keep superseded
+      certificates until they expired, if they were published close in
+      time to the certificate that superseded them. Fixes bug 11454;
+      bugfix on 0.2.1.8-alpha.
+
+  o Minor bugfixes (compilation):
+    - Fix a compilation warning on s390. Fixes bug 14988; bugfix
+      on 0.2.5.2-alpha.
+    - Fix a compilation warning on FreeBSD. Fixes bug 15151; bugfix
+      on 0.2.6.2-alpha.
+
+  o Minor bugfixes (testing):
+    - Fix endianness issues in unit test for resolve_my_address() to
+      have it pass on big endian systems. Fixes bug 14980; bugfix on
+      Tor 0.2.6.3-alpha.
+    - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
+      15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
+    - When running the new 'make test-stem' target, use the configured
+      python binary. Fixes bug 15037; bugfix on 0.2.6.3-alpha. Patch
+      from "cypherpunks".
+    - When running the zero-length-keys tests, do not use the default
+      torrc file. Fixes bug 15033; bugfix on 0.2.6.3-alpha. Reported
+      by "reezer".
+
+  o Directory authority IP change:
+    - The directory authority Faravahar has a new IP address. This
+      closes ticket 14487.
+
+  o Removed code:
+    - Remove some lingering dead code that once supported mempools.
+      Mempools were disabled by default in 0.2.5, and removed entirely
+      in 0.2.6.3-alpha. Closes more of ticket 14848; patch
+      by "cypherpunks".
 
 
 Changes in version 0.2.6.3-alpha - 2015-02-19