instructor can download student list with separated first name and last name
simplify split name method and move it into stringHelper class
fix typo
1. fix typo
2. add test for split name method
fix typo and add case for empty string full name
1. for version like 5.05rc major version list will take in as it is
2. for version like 5.00, previously it will return wrong string with negative value in the string, now it is fixed
Sped up all Db Tests. Now they run in less than 6 secs in total
Merge branch 'dev' into Developer-Utilities
Merge branch 'Developer-Utilities' into 74193950
delete unused images
completed optimisation for all DbTests
speeding up logic tests
sped up CoursesLogicTest
sped up SessionsLogicTest
1. add timing info attribute for activityLogEntry
2. for older logs, no timing info will be shown
3. for new logs, timing info will be shown in format:   m:s:ms
4.only successful request will be timed now
fixed dependency problem. sped up studentsLogicTest
sped up instructorsLogicTest
sped up feedbackQuestionsLogicTest
sped up feedbackResponsesLogicTest
sped up submissionLogicTest