1. admin can search log by info
2. matched key word will be highlighted
update reference in adminActivityLogPage
1. fix NPE
2. add "all" param in url to block testing data
done ajax loading for insStuRecordsPage
make eval visible
make dev green
add test cases for ajax loading
[issue2559] 'all records' page of a student takes too long to load
[2566]adminSessions: NPE

fixes #2566
[2556]adminActivityLog: let the admin search for a keyword in the log message

fixes #2556
added defensive checks to ensure null pointer exceptions do not occur while putting/deleting documents
add auto-loading for 'all records' page
update testing for ajax-loading
[2580] 'all records' page: make responses auto-load
[2565] NPE in instructorCoursesPage
[2516] NPE from instructorCoursesPage
[2539] Deleting courses causes error
[2546] NPE in InstructorCourseDeleteAction