First round of Upstatement files

[#48685567]
Use upstatement layout for pages

Also, erg rather than haml to start with.
No global CSS include for application.css

This lets me create a separate manifest for screen.css (Upstatement's files) and have included files for both in the stylesheets directory.
WIP on Upstatement layout
Compass installation and setup.
Readme editing
Moving old page template
WIP: templating most of the top half of the layout

This brings in Upstatement as far as the main yield of the layout.
[#48685567]
WIP: Templatizing and HAML-izing page show.

[#48685567]
Merge branch 'master' into upstatement
Upstatementing the embeddable partials

[#48685567]
Most of the HAML for a page show.

[#48685567]
Rails-ifying JS tags
Getting closer to the source JS
Page navigation
Data URLs for CSS images
Fixing radio button labels
Reorganizing JS build for runtime
Ties the save div to actual data saving.
Restoring check-answer