[fix bug 931150] Integrate the report submission form with backend.
Upgrade factory to v2.2.1

* Include Decimal fuzzer.
[fix bug 937080] Implement model factories for reports app.
[fix bug 938041] Remove fixtures from reports app.

* Added tests for the submission form of the CR system.
* Changes to NGReport model factory.
* Ignore dirty submodule django-offline-compressor.