renamed ServiceInstance to ManagedServiceInstance
redirect GET /v2/managed_service_instances/:guid to /v2/service_instances/:guid
lift credentials up back to base class
start working on provided service instance model
lift part of validate up back to service instance
cleans up strip_attributes plugin test
strip the name attribute in provided service instance
back-filled basic tests for ProvidedServiceInstance
space developer can provision a provided service instance

[#50700489]
Merge pull request #55 from cloudfoundry/service-connector

split service instance model