Enable GZipMiddleware to improve page reload times

[jonespm]

I believe if we enabled the GZipMiddleware it could make the page times feel a little faster to the users especially advisors with lots of students. This is related to #136 and #122

https://docs.djangoproject.com/en/dev/ref/middleware/#module-django.middleware.gzip

[jonespm]

I feel like we'd have to put this on the route rather than in the app. There's a lot more resources that would need zipped so doesn't make much sense just in Django.