cope with ErrorModule as source (or required) module, and add tests.

add documentation for HTML textbook

Disable nps survey in test environment

Pep8 fixes for drag and drop tests

more cleanups in CMS project

violation fixes

Remove npm package from Ubuntu installation dependencies file.

Install of edX gives the following error:
-----------------------------------------------
The following packages have unmet dependencies:

nodejs : Conflicts: npm

E: Unable to correct problems, you have held broken packages.
-----------------------------------------------

This is caused by the latest version of nodejs including npm and being
incompatible with the previous version.

Fix is to remove npm line from apt-packages.txt

Pylint and Pep8 fixes for InputTypes

Add the ability to add trailing text to textlines

Add tests for unicode and escaped HTML characters

fix pylint errors in test_login.py

Fix/cdodge/studio forum improvements

Fix pylint errors

get_items has an query ambiguity with respect to revision=None. None has a special semantic in get_items as a wildcard, so if we query with 'None' then we'll get back both draft and non-draft items.

Convert login tests to use factories

Create a mock comment service that will listen for HTTP requests on a port