Update MaintainerManager.GetPullRequestsThatICareAbout with some minor cleanup

I was looking through this function to understand better how it works and noticed a few minor things that could be improved. :)
Add even more color to the LGTM column of the PRs list
Merge pull request #79 from tianon/moar-lgtm-list-colors
Merge pull request #78 from tianon/minor-cleanup
Merge branch 'master' of https://github.com/dotcloud/gordon

Conflicts:
	github.go