Fixed post widget "posted on undefined" issue

Changed reference  'ErrorObject' to 'Error'.
Fixed issues in follow widget

1) Changed individual service controller calls to SBW.api call
2) Changed follow widget behavior to follow and unfollow on alternate
clicks
Merge branch 'master' of https://github.com/pkiran/SocialByWay
Merge pull request #26 from jeevaimaginea/master

Fixed issues in post, like and follow widgets.