fixes bug 895235 - CrashStats Subtree Merge

This is a subtree merge of socorro-crashstats (52c26404274bb687a0b3a5c3640fd454270f214e).

After landing, developers will need to run `git submodule update --init --recursive` for the new submodule configuration to take place. I've tested locally after updating submodules and creating a new venv with the django requirements in it:

```
$ ./manage.py test
nosetests --verbosity 1
Creating test database for alias 'default'...
..............................................................................................................................................................................
----------------------------------------------------------------------
Ran 174 tests in 24.416s

OK
```

Vagrant may need some love once this is landed.