Added the tags collection schema for mongodb
Added assignments collection javascript
Added the lookup route for all tags
Added the api to get all tags from mongodb
Added async library of node for complex querying
Displaying all the search categories and fields stored in the db
Made some changes to add the search functionality, created tagDetails.html to display all tags under certain files.
Refactoring part of the codebase to change file names.
Added back the tagdetails.html, earlier git was not detecting rename.
Renamed the angular module name from learningModule to assignmentLibrary
Moved controllers to new javascript file.
Refactored code to move out controllers to new file
Merge pull request #1 from bsharanya/master

Created the tags api and added the tags and assignments models