Merge pull request #11 from rubystar/heroku

Sharing and stats
Save google plus activity
Check existence of attachments
Merge pull request #13 from rubystar/g_plus_with_dj

Save google plus activity
Login and profile linking with social sites
Change method names
Merge pull request #14 from sai59/login_with_social_sites

Login and profile linking with social sites
add validations