erlang-r13: stop using float for version comparison
gcc*: refine sandbox logic.

* Migrate to use "--enable-version-specific-runtime-libs" for
  sandboxing.
* Rename man7 with version suffix.
* Rename rogue files with version suffix.
* Remove libffi stuff.
gcc{43,44}: remove multilib option.

* Building multilib is broken for these GCC versions on Darwin.
gcc49 snapshot 20131027
protobuf 2.4.1

Closes #244.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
imagemagick-ruby186: update URL and hash.

* Old link doesn't exist any more.
* Drop trailing empty line.

Closes #253.
subversion17: use serf resource.
python26 2.6.9

Closes #255.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
Merge branch 'master' of https://github.com/Homebrew/homebrew-versions
marking thrift06 keg only