Fix/adam/log answers with post

Removed some pep8 violations.

Explicitly test the creation and deletion of every component type

Teach rake test_$lib to understand specific test names

Incidental functionality improvements from Next Gen Modulestore work

Make server errors return JSON if requested via AJAX

On Linux, coffeescript refuses to compile unless the `catch` keyword has an error
variable to bind to. On Mac, it works just fine either way. Go figure.

Moved xml_store_config, mongo_store_config, and draft_mongo_store_config...

Moved xml_store_config, mongo_store_config, and draft_mongo_store_config to xmodule/modulestore/tests/django_util.py
Removed some repeated instances of xml_store_config.
Reverted some changes to mongo_store_config so each modulestore gets it's own uuid.

Felix/hinter2

This reverts commit 74d20c20.

Made abtests display its children in the right order.

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.

Fixed various commenting things.

Removed an unused function in the crowdsourced module coffeescript.

Improved commenting in hint_manager.

Fixed pep and pylint violations.

Show a confirmation on asset delete. Fixes STUD-375.