Merge pull request #617 from planemad/mongokit

CSS updates
Merge pull request #618 from planemad/mongokit

CSS updates
Tabs style
Bug fixed regarding login & logout
Merge pull request #619 from sunnychaudhari/mongokit

Bug fixed regarding login & logout
Update node edit header
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Fix off canvas
Prune some unused styles
Rewrite rating bar
Write a global ajax handler to show ajax spinner
Rating bar redesign
Submit rating instantly
Optimize rating functions and templates
changes made in ratings template
Merge pull request #620 from anujag/mongokit

changes made in ratings template
Optimize rating functions and templates
Remove rating_refresh
Make link colors darker
Move rating to sidebar