fixes bug in add backend
Add rename_backend API test
Merge pull request #34 from mistio/rename_backend_tests

Add API tests for renaming backend
Merge pull request #32 from mistio/add_backend_fix

Add backend fix
Import overriden view_config from core if it exists
Merge pull request #35 from mistio/api_log

Import overriden view_config from core if it exists
Merge branch 'staging'