Flowerhack/feature/refactor to track enrollment

Video player: fix acceptance test.

LMS: add CSRF token to register form

Add template for checkboxes to studio.

Stop video skipping links from showing up when not needed and address the issue of skip links for multiple videos.

adding override for GITHUB_REPO_ROOT

allow override for STATIC_URL

This is the base directory for course data

Stop video skipping links from showing up when not needed and address the issue of skip links for multiple videos.

Fixes BLD-521

fix emission of enrollment events from the CMS

fix spammy log messages from course_id tracking in CMS

I suspect there are very few circumstances that an enrollment event is emitted from the CMS, but if it ever were to happen, it would bomb out because the "crum" middleware is not used in that app.  We are hoping to replace this request caching hack in the near future, but for now it is the best option we could come up with.

I noticed the stack appear when I created a new course in my dev environment.  Presumably the course author is automatically enrolled in the course, which, causes the tracking code to bomb out.  Luckily we catch the error and just log it, but we really should be capturing this type of enrollment event.

Email port to beta dash and new option for shibboleth courses

Fixed bug where Flash photo taker would fail

into beta dashboard.

Also includes new functionality, in both legacy and beta
dashboard, to include appropriate email text for a
Shibboleth course.

Video player: improvements.

Video: tests to check speed change

Change save_item and create_item to be RESTful.

hidden-module-unicode: Return unicode string to pass assertion

Studio: Resolves Notifications UI showing in IE9 + CSS Split

Sarina/persist student answers on error

Part of STUD-847.

Fix for advanced settings failure

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

Oleg/fix rearrange bug in problems

XBlock Fragments expect unicode strings, and fail on an assertion when
it isn't:

```
2013-11-14 07:55:50,774 ERROR 3788 [django.request] base.py:215 - Internal Server Error: /courses/TestU/TST101/now/courseware/41d55c576a574fde99319420228f7f88/5fef5794e34842f4a2d45ebcdeaa9a3a/
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 20, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/decorators.py", line 91, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/views/decorators/cache.py", line 75, in _cache_controlled
    response = viewfunc(request, *args, **kw)
  File "/edx/app/edxapp/edx-platform/lms/djangoapps/courseware/views.py", line 407, in index
    context['fragment'] = section_module.render('student_view')
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/core.py", line 156, in render
    return self.runtime.render(self, view, context)
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/x_module.py", line 903, in render
    return block.xmodule_runtime.render(to_render, view_name, context)
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/runtime.py", line 356, in render
    frag = view_fn(context)
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/seq_module.py", line 77, in student_view
    rendered_child = child.render('student_view', context)
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/core.py", line 156, in render
    return self.runtime.render(self, view, context)
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/x_module.py", line 903, in render
    return block.xmodule_runtime.render(to_render, view_name, context)
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/runtime.py", line 356, in render
    frag = view_fn(context)
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/vertical_module.py", line 27, in student_view
    rendered_child = child.render('student_view', context)
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/core.py", line 156, in render
    return self.runtime.render(self, view, context)
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/x_module.py", line 903, in render
    return block.xmodule_runtime.render(to_render, view_name, context)
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/runtime.py", line 356, in render
    frag = view_fn(context)
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/x_module.py", line 464, in student_view
    return Fragment(self.get_html())
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/fragment.py", line 34, in __init__
    self.add_content(content)
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/fragment.py", line 71, in add_content
    assert isinstance(content, unicode)
AssertionError
```