Remove unused valiables
Cleanup .travis.yml
Merge pull request #20 from tricknotes/remove-unused

Remove unused valiables
Merge pull request #21 from tricknotes/cleanup-travis-setting

Cleanup .travis.yml
Add onBegin and onEnd callbacks
Merge pull request #22 from teddyzeenny/loop-callbacks

Add beforeLoop and afterLoop callbacks
Add simple backbone example to readme
Merge pull request #23 from teddyzeenny/backbone-example

Add simple backbone example to readme