Fix synchronization between sorted list and model

I'm not sure what's the reasoning behind those two lines, but removing them seems to fix Issue #433.
Removed comments
Merge pull request #442 from skahlert/patch-1

Fix synchronization between sorted list and model
Moved composed sort callbacks into closure

This should fix a problem I had, in which multiple sortables clobbered up each others scope.
For example updating a REST resource didn't work, because always the route of the last sortable in the DOM was called.
Merge branch 'master' into patch-2