Added instructor persmission to _has_access_error_desc() in courseware.access.

TNL-208
Merge pull request #5174 from edx/usman/tnl-208-instructor-permissions

Added instructor persmission checking to _has_access_error_desc() in courseware.access
Country and City fields in auth_userprofile

ECOM-128 adds a country dropdown to student registration
Merge pull request #5180 from edx/ahodges/doc/DOC-909

Country and City fields in auth_userprofile
Update public_sandboxes.rst
Fixed full screen functionality for image module in HTMLModule.
TNL-265