Changes to accommodate new Django version, and uploading my version of trello.py to prevent needing to update code to use the new and totally changed one. Some things you upgrade to and some you just keep :)

1. Remove trello from requirements.txt and inline it in the most barbaric way. This is a direct copy paste from my server and who the hell knows if this corresponds to any version ever released of trello on pip.

2. Apparently saving models in sessions is considered bad practice, so instead of saving the user model in session, I only save the id and then covert it to user model every time. Meh.
Fade out the email solicit if email was successfully added, leave it if not.