Added pretty name for test student (student view enrollment)
Added logic to remove test student from section enrollments and to ensure that the count excludes test student.
Added TEST_STUDENT_ROLE to settings to enable filtering by role
Moved the role vale to settings
Added test cases for utility ‘get_enrollments_without_test_student’. SInce the backend call that fetches the enrolled was moved to the utility, had to fix some of the existing test cases to use this utility
Added more test cases
Removed an unused stub in testing utility
Made changes as per code review:  Moved test data input into global variables defined outside the method to reuse across a a few methods.
Merge pull request #71 from Harvard-University-iCommons/feature/SectionsTool_SM

Feature/sections tool sm
Merge branch 'develop' into feature/display_enrollees_in_name_buckets

Conflicts:
	add_people/templatetags/aptags.py
	add_people/tests.py