Modifid appearence of top menubar and some changes in drawer_widget.html also removed unecessary js and css files.

Modifies appearance of top menubar :
  - Changes made in gapps_menubar.html
  - While current GApp is highlighted with green background.


Modified drawer_widget.html - added some arrows in place of buttons for up, down, top, bottom.


Deleted files in static/ndf, which were associated with bootstrap framework :
  - Bootstrap folder. 
  - some js files in js folder.
  - fonts folder in static assocaited with bootstrap