Gollum version

[brandonwillard]

I couldn't get the gollum tab in a project to work without changing the Gemfile to specify a v2.2.0 tag:

gem "gollum", :git => 'git://github.com/github/gollum.git', :tag => 'v2.2.0'

Otherwise, it would error-out with uninitialized gollum constants (only when viewing that project tab).

[Vanuan]

The git master version was used because there wasn't released version at that time. Now we can use the published version.

[Vanuan]

This fork is a bit rotten. There a fresh forks out there: https://github.com/gugod/redmine-gollum/network