Adding the express stub for files and other services and few angular changes

Added the ng-Table to show files
Added the angular services to fetch search items/files etc..

Harish can refer to the json format used in demorestapi/file.js to
design the php rest endpoints, once the php bcackend is ready, just
change the urls in services.js file

 * Navigations still needs to be worked upon.
 * We are using bootstrap 2.3.1 (Why??) Can we upgrade to 3.0.1?
 * Which directive is better to display the files and search results?
 * ngTable with pagination support or ngGrid?

Reviewer:Srini Kusunam