Change db from sqlite3 to postgresql for heroku deployment
fix bug logo url to absolute /assets
Fixing asset loading for Heroku

http://stackoverflow.com/questions/16669991/most-of-my-assets-suddenly-return-404-after-a-push-to-heroku
Merge pull request #3 from bluefocus/patch-1

Thanks @bluefocus, So quickly fixed.  I really begin to like Agile Dev.
Merge branch 'master' of github.com:limingth/sharedin.us
Add Devise for sign in/out
Create sign-up page
Add user_list view after sign-in
Fix bug for left_sidebar view
Add Tag to User
Implement search feature
Add connections to find shared tag in users
Fix bug about re-tag and capitalize tag name
Add user picture and connection circle from linkedin
Fix bug in search tag form to make tagname capitalize
Fix bug on left sidebar making message unlink
search_result css, #5