Pr 434 const

This is a test of the graft behavior we can use once we've merged `crashstats-subtree` into master.

Basically its another subtree merge on a branch. The process is roughly:
```
git checkout -b pr-###-const
git remote add -f socorro-crashstats-mr-const git@github.com:mr-const/socorro-crashstats.git
git fetch socorro-crashstats-mr-const
git merge -s ours --no-commit socorro-crashstats-mr-const/master
git read-tree --prefix=webapp-django/ -u socorro-crashstats-mr-const/master
git status
git commit -am "graft pr ### - {{ merge commit message }}"
git push origin pr-###-const
```