Update to underscore 1.5.2, add development version
Move third-party CSSs to /css
Improvements to login page
Added angular scripts

* angular
* angular-animate
* angular-resource
* angular-route

* rcSubmit: For form validation
Added background image to footer and linear gradient to the body.
Login: Change linear gradient direction
Angular is integrated to app administration
Administration: Improved visual style
Improved active nav tabs
Rename controllers