can specify last name using brackets
Change assert statements
Disable options that should  not be selected.
temp push
Fix some tests
Merge branch 'master' of https://github.com/TEAMMATES/repo into Issue2386
fix tests
temp push
Merge branch 'Issue2386' of https://github.com/TEAMMATES/repo into Issue2427
handle last name in CSV files
1. remove unnecessary method in StringHelper
2. fix all related tests
3. update FeedbackResultsDownloadActionTest for last name within braces
1.update student list download action test
2.update comments for feedbackSessionLogicTest
1. temp push
1. separate student first name and last name in Feedbackreuslt CSV
2. update comment and tests
add more files for instructor search purpose
add necessary methods in Db and logic for admin search for instructors
1. fix typo
2. add missing logic for search for admin searching for instructor
basic working version of adminSearch
merge dev into Issue2427
user can only specify last name using "{}"