Fix Build#duration when TimeZone is not UTC

I got wrong Build#durations, cause ServerTime is not UTC.

Sample Output:
    $: build.from
    => Sat, 30 Mar 2013 16:58:42 UTC +00:00

    $: Time.now
     => 2013-03-30 18:20:25 +0100

    $: Time.zone.now
     => Sat, 30 Mar 2013 17:20:29 UTC +00:00
point setup doc to 2-2-stable branch
Bumps rugged version to 0.18
Serving gravatar images form an https source
This is safe to run on gitlab-ci http and https servers
Fix Checkout command to use 2.2 stable (instead of 2.0)
Merge pull request #173 from Philzen/patch-1

Fix install.md checkout command to use 2.2 tag/branch
Merge pull request #156 from alexdo/master

Bumps rugged to version 0.18.0.b1, resolving GPG issues
Remove runner functionality. Added api for builds
Remvoe runner specs
Remove runner from seeds
Remove repo reading logic from project. GitLab CI does not store repos any more
Remove Run functionality
Runner resource. Now only registered runners can use gitlab-ci
Build belongs to Runner
Show amount of success/failed builds per runner
Fix specs
Fix schedule builds
set pending status for Build#create_from
Replace devise with auth via gitlab api
Drop users table. Fetch user owned projects from gitlab