track demo
models and views added
calendar api improved
background grid added
booking and unbooking of slots added in the model
code revised
slot count check added
slot count check and warning display on the track
bug fixed while removing slots with a warning
preparing tracks and slots to accomodate draggable functionality
interface modified
Merge branch 'master' of https://github.com/abhisheksarka/scheduling
slot range system added to tracks
 added loading and setting of slot ranges in tracks
branch merge
conflicts resolved
bug fixed while selecting slots
draggable and droppable
resizable bug fixed
draggable and resizable