Make render_template mocking clearer

fix for ie bug where drop down menus were still clickable when collapsed

Cale/lms xblock student view

Fix broken Studio signup.feature acceptance test

Fix word cloud modules not exporting correctly.

Jonahstanley/upgrade chrome version

Quiet mongoimport noise during tests

Remove get_preview_module.

"Graphical Slider Tool" integration into studio

This makes the LMS use an XBlock's student_view, rather than an
XModule's get_html to render for display. However, it does not yet use
wrap_child to handle instructor debug information or url rewriting.

[LMS-219]

`world.css_find()` to protect against StaleElementException
in Jenkins.

    And replace calls with calls to load_preview_module.

Grant admin rights to members of the course team

This allows a more general approach to modules such as word_cloud and
video which have no XML data (it's all store in metadata), but use
XmlDescriptor for backwards compatibility. They now generate an empty
tag on export, and clear out empty tags on import.

Also a small change to the video module as a result -- if it's asked
to parse empty XML data, it won't try to parse anything.

Yet another Course Info bug

Show dates when the data was collected in the instructor dashboard panel

fix for underscore template issue for xmodules

Studio: Improvements for loading JS templates on Advanced Settings and Course Updates pages

Feature/kevin/email notifications panel

Only redirect when redirect url is an internal page.

add EDX_API_KEY to aws.py