Merge tag 'v1.5.2'

1.5.2
Prevent autoAttach from overriding existing data source
Minor wording cleanup.
Fix capitalization and punctuation.
Minor wording change for testing purposes.
Fix the typo for the method name
Fix the method args
Fix race condition where MyEmail model was not attached to the correct dataSource in tests
Fix user test race condition
Add lookback.getModelByType() and use it resolve model deps
Lookup the email model
Fix the Scope reference to models
Fix the Role ref to RoleMapping
Add a test for autoAttach
Merge pull request #150 from strongloop/feature/fix-auto-attach

Prevent autoAttach from overriding existing data source
Bump version
Merge branch 'release/1.5.3' into production