Merge pull request #16 from denisstepanenko/denis1

this pull req. can be merged automatically, assuming it's OK to merge it....
Merge branch 'master' into denis1
removed local ref to chat var and moved SignalR initialization to $init as otherwise it was ending up in a different scope.
Added Requirements Document
Google Plus authentication implemented using AngularJS directives - initial checkin.
Linkedin and Facebook authentication not fully implemented yet.
Merge pull request #19 from denisstepanenko/OAuthIntegration

Google Plus authentication implemented using AngularJS directives - init...
Merge branch 'master' into denis1