Adds datasetmodified event
Renames Pdict and Pctxt resources
DataSet -> Dataset
Fixes DataSet -> Dataset assocs
Adds new field to stream definition: available_fields.
Adds transform function resource
Adds compatible_stream_definitions to pubsub
Adds get_data_product_stream_definition to dpms
Adds process_type to DP and correct fields for TF
Resource mgmt for TransformFunction
New services calls for dataprocess mgmt
Adds appropriate associations

These associations correspond to this digraph:
https://docs.google.com/file/d/0BwGScp7mjYjyeVVmQXdFTm9xSTA/edit
Merge pull request #279 from lukecampbell/retrieve_cache

Resource modifications