Add local.py, django-storages for s3 images and statics

[jnayak1]

• [x] Add local.py settings configuration
• [x] Add django-storages for s3 images and statics
• [x] Save images locally if developing locally
• [x] Add Author headshot
• [x] Fix pep8 issues
• [x] Add invoke command so that we can test for flake8 locally before pushing

Note: Statics were uploaded to s3 because it was super easy. We can switch over if necessary any time. Looking into it a bit, I don't think there's a big performance difference. The html page gets sent to the client and then the client requests the static files the page specifies. I don't think there would be a huge difference at least for now whether we serve those from s3 or our ec2 server.

[leodomingo]

Some PEP8 issues here, Travis has a full readout