pearson registration - changed accepted classes, content, and styling to use the term process instead

pearson registration - revised UI states for reg form, simplified markup for form fields, synched button styles/text b/t registration form and dashboard

switch back to returning json to test_center_register template, and enable jquery handling in template.

fix migrations, removing one field and making another nullable.  Update registration page to allow for editing only demographics.

Revised Georgetown University seal/logo for edx.org use

Bugfix/kevin/mathjax rendering

Add member services job descriptions

[Finished #40869383]

Ignore discussion modules with missing keys when building the global dis...

Extract installation of system dependencies from create dev script

Bug/tom/pearson ie7

[#40869383]