fix(sortable.js):add "onStop" in vars
Merge pull request #3 from tamtakoe/patch-1

fix(sortable.js):add "onStop" in vars
Allow for updating options

I $observe the attrs for changes and update the options. This enables you to update the options on the fly. 

Example being enabling and disabling the ability to sort, during an "edit" action.
Merge pull request #4 from robjames/master

Allow for updates to the sortable options
fix: slight tweak to $observe code
Merge branch 'gjungb-master'

* gjungb-master:
  added {} and ; to make JSHint pass
  added var statement for 'onStop', reordered vars changed comment from _start to _stop

Conflicts:
	src/sortable.js