Merge pull request #37 from madimalo/master

Tags and 120 characters
1. fixed an mongodb issue in story clean up 2. Update top_stories instead of insert again
Merge remote-tracking branch 'upstream/master'
improve extract tags
Merge pull request #41 from madimalo/master

1. Added categories to the admin page. 2. Fetch data from top_stories table. 3. Added authentication and authorization to all admin api calls.
Merge pull request #38 from xiatao123/master

	 1. fixed an mongodb issue in story clean up 2. Update top_stories ins…
Fixed two issues.
Merge branch 'master' of https://github.com/frankyanwang/SmartRead