Initial commit of Stanford's edX theme files
Update directory structure and static refs

Themes now have their static assets namespaced under `themes/<name>`
to avoid collisions with edX assets.
First major revision of Stanford theme files

This commit represents most of the Stanford-specific theming work
that went into version 1 of class.stanford.edu running the edX
software.
change .container to .su-container and .row to .su-row etc...
bunch of theme changes: footer
Move files around for cleaner layout

Until we theme the CMS and the common templates as well as the LMS,
we won't create specific directories for them. This keeps the theme
includes in the main edX templates cleaner (no `lms/` prefix).

This commit also adds some cleanup changes to the header, like
using the `static.url()` helper and adjusting block names.

NOTE: this is incompatible with the existing changes on
test.class.stanford.edu and class.stanford.edu. DO NOT DEPLOY this
until the theming PR lands on edx-platform/master.
Add static about and TOS pages

Before, these files lived in the lms/templates/ directory of our
special Stanford branch. Now that we're trying to get our template
changes merged, we move them here.
register/login overrides
added -color-d1
added -bg
added -content-wrapper-bg color
Add overridden password reset email

Override the default edX password reset email to provide one with
Stanford-specific language.
added directory with maintenance page
Merge branch 'master' of github.com:Stanford-Online/edx-theme
fix css background pattern
add alt attribute to home page link logo image
changed top margin of maintenance page content
added link to footer for http://code.edx.org
The edX platform -> OpenEdX
change selection color to dark gray