Merge pull request #69 from stulees/master

Remove setting "url" on controller scope
added github contribute button to style guide
Merge pull request #71 from nexus-uw/feature/github-contribute-btn

added github contribute button to style guide
change btn to the same grey as the help btn
Merge pull request #72 from nexus-uw/bug/github-contribute-btn/style-as-help

change btn to the same grey as the help btn