Fix Garrett Cooper's name.

Sorry, Garrett!
Merge branch 'release-1.7.x'
Fix prepare-dev.py to not link djblets static media

Now that djblets is fully pipeline-ized, we don't need to create the static
media symlink. This was extra broken, because djblets/media doesn't exist
anymore, so new users trying to use prepare-dev.py would just get an error.

Reviewed at https://reviews.reviewboard.org/r/4812/