renaming instance var pandasmodel to pivotmodel
no longer need collections
factored out pandas data source from pandas pivot.
switched to use pickled rather than filesystem data
added read only api key to docs
moved document auth  into decorators
auto create client and pass that into all models, so they can resolve lazy refs if they need to
previous pandas ui demo now works with new pickled dataframes
had to base64 encode in order to save pickled data in redis

need to prevent pandasdatasource from being broadcasted