fixed old remove_from_section tests to include resource_link_id
added four new tests  to test resource_link_id match, course_id match, conclude_enrollment success and failure
views.py - cleaned unnecessary exception checking from remove_from_section to put it  in line with similar functions
removed extraneous includes
incorporated suggestions from code review.
Merge branch 'develop' into feature/carter_tests

# By Bermudez, Jaime (2) and others
# Via Yip, Josie (2) and others
* develop:
  Update from code review and added 1 more test case to be more specific when course ids’ numbers don’t match.
  Update unit tests and added new unit tests
  Update error message when failing to retrieve section details.
  Section details view logs exception and renders an error page if retrieving a section raises an exception.  Split tests for this method into a separate file.
  changed the field name for required reading from "reading" to "required."
incorporate changes from code review
- remove extraneous test
- clarify logging in views.py
Merge pull request #114 from Harvard-University-iCommons/feature/carter_tests

Feature/carter tests