Cdodge/meta data cms editing

Define 'system metadata' which should not be editable by the end user. When posting back metadata edits, we need to fetch a copy of the existing metadata and apply the changes.

Quick fix for scores within a homework/lab showing up in reverse order.

The real fix would be to have yield_dynamic_descriptor_descendents return
things in the proper order, but I'm not entirely sure what's going on
there, and this is a bug on prod now.

adjust implementation to reflect feedback from Calen. Also limit the jQuery selection to be within the metadata-edit region, just to avoid picking up other elements decorated with that attribute

optimize!

Also make the actual ?next redirection work with caching

- use js instead of django to do the redirection

Fix login-if-?next behavior

fix up syllabus

make progress label wider

Kimth/fix gradebook

* for more context, see https://basecamp.com/1892446/projects/631155-devops/messages/4719963-strange-caching

Fix forums in IE9; apparently it's just very strict about the charset be...

Fix forums in IE9; apparently it's just very strict about the charset being a valid identifier. utf8 is not a valid identifier, utf-8 is.

Feature/arjun/minor style changes

Some 188-specific styling + default styling for static tabs

- apparently have to define functions before using them...

Add more info to debug view

Make static tab url pattern less greedy

add a debug_request view that prints the request.

Put SequenceDescriptor back as a subclass of MakeModuleDescriptor. THe previous change to have it derive from EditorDescriptor was not safe as EditorDescriptor presumes that there is a edit box in the JS save flows. So we need to edit get_context() on MakoModuleDescriptor to also pass along the metadata to the Mako rendering templates

Merge branch 'cdodge/meta-data-cms-editing' of github.com:MITx/mitx into cdodge/meta-data-cms-editing

Conflicts:
	cms/static/coffee/src/models/module.coffee