This reverts commit a517dc20.

This reverts commit ec01253e, reversing
changes made to ae8c9710.

as a first step to separating db connection from modeling
and to support location mapper and contentstore using same db config as modulestore

Make django use_tz

Start linting envs files, add task to only pylint errors, and move pylintrc file to the correct location

* Note: This doesn't run yet
* add config file for lms on mongo
* Some comment additions and cleanups