Merge pull request #192 from FonsRademakers/master

Description of alternative way to build a gem, fix for filename link color in <h2>.
The regular expression adjusted to include the underscore in repo name.
Merge pull request #195 from kovalevsky/master

The regular expression adjusted to include the underscore in repo name.
Fix the issue of notifications for all commits being sent out when a new branch is pushed with unique_commits_per_branch set to False
indent style
Version nump to 0.12.1
GitlabHQ 4.x or above have slightly different links, closes #196
make sure the more opaque diff's (.rr, .aa) are also monospace fonts,
like the rest of the diff.