diff view on commit with parallel diff view

TODO: fix comment forms to respect left and right columns
Fix overflow on project home page for long names

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Show ruby version on admin dashboard
Merge branch 'show_ruby_version' of /home/git/repositories/gitlab/gitlabhq
Merge pull request #5308 from Popl7/parallel-diffs-side-by-side

diff view on commit with parallel diff view
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Mention parallel diff feature in CHANGELOG for 6.4

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge pull request #1 from gitlabhq/master

Update master-Branch