Part of #16: basic file upload

- Logs filename and size
- Commented out form and view for showing an upload form
- You can POST and see the debug statements.
Part of #16: upload returns JSON response

TODO: content type is still HTML.
Part of #16: PoC proving file upload
Cleaned up crawler code
The crowning jewel of #16: finalized file saving

Also re-added manual file upload for testing.
Resolved #16: tests for uploading