Fix error when there is an invalid YouTube property in a video module

Make descriptorsystem inherit from Runtime

Conflicts:
	cms/djangoapps/contentstore/views/preview.py

XBlock integration for Studio: student view

instructor dash fixes

Coffee compile command now executes for just *.coffee items.

Add new setting to cms project

Migration videoalpha module to one main video module

Change console logging stream from stdout to stderr

Enable beta dashboard, add copy, add i18n

Calc module changes: previewing and <formulaequationinput>

To see individual commits, see tag peterb/formula-preview/presquash

Named `FormulaEquationInput` (name up for debate)

- Based off ChemEqnIn
- Add FormulaEquationInput in inputtypes.py
- Add a call to a skeleton method for a preview

javascript:

- Queue up some MathJax
- Put some ordering on the AJAX requests: add a parameter when the request was started, when it returns check that it isn't outdated before displaying the preview
- Tests

Note: we moved the `jsinput` tests and DISABLED them, because they were causing the tests to fail.

- Create a method called `parse_algebra`. It takes a string of math and returns with a `pyparsing.ParseResults` object representing it.
- `evaluator` takes this tree and applies the old "parse actions" to it to get the same number as it used to.
- Change calc's API: `evaluator` to use `case_sensitive` rather than `cs`
- Add most of the capability for latex rendering

Failing JavaScript tests in Firefox

Fix manage.py to ouput the help of the django command if requested

Fix mysql indexing validity in migrations

This resolves an error that would sometimes occur on Mac OS X:
"Error: EMFILE, too many open files"

Blapenta/site packages

Make CMS user view not show ErrorDescriptor courses

Fixed all common and LMS tests.

The tests were failing because XMLDescriptor adds in some attributes
to _model_data, such as `xml_attributes`, that aren't necessary. The
solution is to handle all XML parsing in VideoDescriptor. There's
still one test failing in CMS, which has to do with metadata being
saved. I'm still working out how to update it in such a way that it
doesn't fail, but still tests something meaningful.

Feature/cdodge/convert to portable links on import and clone