Perf Improvement: don't digest after the $timeout.
Merge pull request #292 from BrianGenisio/master

feat(sortable): remove digest from $timeout on sortable('refresh')
refactor(sortable): correctly pull attribute when using data attributes
chore(sortable): clean up whitespace
Merge pull request #295 from fishfacemcgee/clean-attrs

fix(sortable): also check 'data-ng-model' in update callback