comment out dist tests
Update cached models and collections instead of replacing them.

This also takes into account that collections can be either "current" or "self".

New methods:
store.getCurrentCollection()
bbSiren.parseModel()
bbSiren.parseCollection()
Bug fixes

New methods:
Model.update()
Collection.update()
bbSiren.addModelToStore()
bbSiren.addCollectionToStore()
Fix .update() methods
Merge pull request #57 from kiva/update-not-replace

Update not replace