Call the error callback and bail out when synchronous HTTP errors are received
Stylistic fixes
Various fixes from testing
Fix up user deletion
Fix and UT fix to user deletion
Code review markups
Merge pull request #65 from Metaswitch/release_numbers_on_error

[Reviewer: Alex] Release numbers on error
Make the tests expect force_delete as a keyword rather than positional argument
Merge pull request #75 from Metaswitch/release_numbers_on_error

[No reviewer] Make the tests expect force_delete as a keyword rather than positional a...