A new modulestore backed by mongo that changes the data format to
facilitate easy versioning, sharing content between courses, and fast
lookup of course structure and Scope.settings data.

Conflicts:
	cms/djangoapps/contentstore/tests/test_contentstore.py

Acceptance_static is used to prevent collect static from using a seed
test.py had its seed removed due to redundancy

The template exists when django admin is enabled, but the mappings in CMS' urls.py do not exist.

DraftModuleStore was originally designed as a mixin, but never used that
way, and with the upcoming changes to use the versioned module store,
never will be. This changes removes a circular dependency between
mongo.py and draft.py.

test.py was changed such that the database being used is test_xcontent
course_helpers.clear_courses now calls contentstore().fs_files.drop() such that all content is removed and the databse is started afresh in the same manner as the modulestore

Make django use_tz

PREVIEW_LMS_BASE must now be set (default value does not work for both edge and edx). Make this work locally as well.
https://edx.lighthouseapp.com/projects/102637/tickets/331

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

#324

acceptance tests.

Use setup.cfg to set up default settings when running nose tests. Enable
the rednose library to color test output.

use django caching to hold computed metadata inheritence. Also invalidate the cache entries on writes (insert, updates)

Move modulestore unique naming in tests from the settings.py file into the ModuleStoreTestCase class.