Created billing app and updated pip requirements
Refactored API; Finally got a unit test to run
Added some more unit tests
Remove unused import.
A number of PEP8 fixes; Using @property decorator; Moved call to log.startLogging into Django management command; Setting selected account ids on Django session instead of url parameters
Merge branch 'feature/issue-669-billing-module-create' of https://github.com/praekelt/vumi-go into feature/issue-669-billing-module-create
Remove unused imports.
Refactored code structure as suggested and updated database model
Merge branch 'feature/issue-669-billing-module-create' of https://github.com/praekelt/vumi-go into feature/issue-669-billing-module-create
Added 'Message cost' column to Account admin page and updated the CREDIT_CONVERSION_FACTOR value
Added postgres as Travis service dependency and fixed failing tests
Updated service name to postgresql
Asking Travis to create a postgres db for billing api test cases
Rounding credit_amount field to the nearest int
Merged with develop
Merge branch 'develop' into feature/issue-669-billing-module-create

Conflicts:
	.travis.yml
Renamed RealDictConnection to DictRowConnection and RealDictConnectionPool to DictRowConnectionPool
Using Python 'all' function for cleaner implementation
Merged with develop
Added template for billing dispatcher config