Removes sortable directive to be used as bower component
Updates references of my-sortable to cask-sortable in features
Adds cask-angular-sortable as bower dependency and adds it as dependency to main app
Merge branch 'develop' of https://github.com/continuuity/loom into feature/update-sortable-module

Conflicts:
	coopr-ngui/app/features/clusters/detail.html
	coopr-ngui/app/main.js
	coopr-ngui/bower.json
Merge pull request #770 from caskdata/feature/update-sortable-module

Feature/update sortable module