Let JS responses return >1 point

Fixing order that problem scores are displayed on the progress page

Kimth/limit queue dos

Refactored wiki cheatsheet code.

Remove trailing slash from ajax url in ModuleSystem

* also add a check for valid location in modx_dispatch

updated admin_dashboard to show count of unique students

Feature/cale/eagerly load modulestores

commenting out the pre-loading of modules until we get a better way in place (that doesn't hang on deploy)

Allow location url_names to contain ':', mapping to / on file load

Fix latent bug in access checks in get_module

Eagerly load modulestores on server startup