Error handling: Model-level validations, proper error responses. (added coverage for new instance status call)
Error handling: Model-level validations, proper error responses. (removed deprecated error template)
Error handling: Model-level validations, proper error responses. (backport assert_raises as context manager for Python 2.6)
Error handling: Model-level validations, proper error responses. (fixed typo)
Merge pull request #167 from DreadPirateShawn/ErrorHandling

Error handling: Model-level validations, proper error responses.
0.3.5