Refactored container datastore layer to support different datastore backends
Refactored couchdb datastore
Added call tracer utility to container
Added couchbase datastore backend
Added PostgreSQL datastore backend
Added postgres and neo4j prototypes
Enhanced postgres geospatial column handling
Drop connections on force clean postgres database
Int test and with-pycc updates for postgres
Bumped to latest ion-definitions
Merge pull request #433 from ooici/postgres_merge

CIDEVSTC-201,202,203: Pyon enhancements for Postgres