Added ability to load specific sheet in spreadsheet.
Implemented Canvas Load functionality
Added web mock stubs.
Upgrade Rails version. Use canvas-api gem.
Change default Canvas domains
comment out lti feature specs for now.
Adjusted cartridge course to match values in spreadsheet.
Use sis_id for teacher
Renamed class after switching to canvas-api gem.
Fixed render of course name.
Added code to build sample courses, users, and enrollments.
Schema update.