make ENABLE_SHOPPING_CART truly optional

course_about was throwing 500s if ENABLE_SHOPPING_CART=False

Fix course enrollment count in instructor dashboard

Add .noseids to .gitignore, but first organize it.

Fix AN-115

First caption does not display outline on initial mouseover.

Streamling, test, and fix issues with image uploading

old pr 271 comment fixups

Clean up open ended problems view and fix error.

Streamline and test uploading ... remove requirement that uploads be images, can now upload any file.

Move nose arguments around so that we can run tests with manage.py

Move init to top of class
Change asserts to more meaningful exception types
Refactor hard-to-read fn

Upgrading to 1.4.8

Disables the previous/next arrows on pdf books on the first/last pages

Added setting to disable 'find courses' links

Move Pearson courseware imports to function level.

An assortment of small OE changes, both for ICE and standard

- Changed save OE message text
- Fix ICE legend positioning and content
- Add space to "offensive" checkbox
- Change tracker variable in undo to correct one

Pull XModule attributes out into a mixin that can be applied to xblocks

Adding Pillow jpeg and tiff system libs

update discussion forum doc

Clean up after hotfix to fix xml loading for import

Fix for PR 1119.

A Jasmine test was falling. It went unnoticed. The PR was merged. This
is a fix for it.

caption display problem

We had a bug where mixins weren't being applied before `load_from_xml`
was called. This meant that not all of the fields were being loaded
correctly. To fix it, we used the mixoligist from the runtime to apply
the mixins earlier in the process. However, that caused the mixins to be
applied twice.

The included fixes to xblock resolved the multiply-applied mixins, and
the fixes to the parsing code make it simpler to understand, and add
some unit tests of the parsing to boot.

This command loads the courses with the XMLModuleStore, and then exports
the fields contents as json in a diff-friendly way. This can then be
used to validate against regressions in the xml parsing code.