Refactoring & tests: refactored createCourseDiv: moved part that builds
remove button to a new function.

Added a few new tests for getCourseColor.
Refactoring & tests: refactored createCourseDiv: moved part that builds
remove button to a new function.

Added a few new tests for getCourseColor.
Merge branch 'master' of https://github.com/uiuc-cs428-urs/frontend.git