add a demo collection with batch actions
better handling of toJSON for collections
if collection.toJSON is passed an action name, append each model's id.
add .save() method to collections
add .validate() method to collections
add comment
fix tests
start adding collection.save test
replace .getAllByAction with .toJSON
fix test
add a ._validate routine to be consistent with backbone
getting close to batch actions
this should get nested batch working