Added the navigation controller to show/hide login/signup/logout
Added the controllers/services to show the files in tha ng-table
Integrated the uploading of files through ng-fileupload
Added few of the services to handle the user sessions through cookies
Added utility library underscore
Upgraded to use the bootstrap 3 latest version

Reviewer: Srinivas
Merge pull request #6 from harry1989/master

Added the navigation controller to show/hide login/signup/logout, Merging the changes since @skusunam has already taken an initial look and review the changes once merged.