Added nested sort javascript. Still need to get the feature sort
working.
Changed from sort to move. Sections are working, but features aren't
yet.
Remove dropped element. Sortable creates a ghost copy that confuses
angular.
Added placeholder
Merge branch 'master' into nested-sort

Conflicts:
	assets/js/filesystem.js
Added tolerance for sorting to make it smoother
Merge branch 'master' into nested-sort

Conflicts:
	assets/js/directives.js
Added back flag sorting support
Fixed the duplicate bug with nested sort
Spacing in directives.js