All apps in ext_tools use the same database, so remove the custom db router and app_mappings from each settings file.  Also, add in the ISITES_LMS_URL setting for each environment - this is used by the course site wizard in the event that an official course site already exists and it is an iSite.
Revert back to canvas_token key name.
Add config setting to test.py - even though it's not being used for ext_tools currently.
Merge pull request #20 from Harvard-University-iCommons/feature/remove_database_routing_add_isites_lms_url

Feature/remove database routing add isites lms url