moved db_string to local_config.py; get parameters for course_id and section_id from client to use in runestone
long expiration for credential
proper way to do local settings for web2py, in file models/1.py
Merge branch 'master' of https://github.com/presnick/lti4web2py into local_config
kludge to make all the necessary models from runestone available here, so that course_id and section_id can be filled in when a user is created or updated via lti
Merge branch 'master' of https://github.com/presnick/lti4web2py into local_config
more tables defined in db.py
Merge branch 'master' of https://github.com/presnick/lti4web2py into local_config
don't migrate tables; leave that to runestone if it's ever needed
Merge branch 'master' of https://github.com/presnick/lti4web2py into local_config
more fixes to make lti work with runestone to create or update auth_user records