Bulk Uploading Users with CSV

This requests creates a page for uploading users in bulk through CSV file parsing. The actual step of inserting the users into the database is incomplete, as my experience with SQLAlchemy is extremely limited, and I felt that I was unlikely to do a sufficient job on that piece. However, there is a dummy "success" response in the final submit step  that allows the workflow on the page to complete.

This is intended to fix issue #2