hide frComment's control bar when edit
some fixes for frComment

1. it loads comment text into edit textarea
2. show frComment control bar aft ajax handling for edit
3. update added row aft ajax handling for add, so that it confroms jsp html
remove slightly gray frame above comment's list
change additional info table's heading

in insFbResultsByGiver/ByRecipient/ByTable
make dev green for insStuRecords
make dev green for instructorFbResults
Merge branch 'bootstrap' of https://github.com/TEAMMATES/repo into bootstrap