Merge pull request #7 from Nurhashimah/master

Updates on Instructor Appraisal & Lecturer Appraisal, plus clean-up for timetables_controller
Merge remote branch 'upstream/master'
Merge pull request #8 from Nurhashimah/master

Temporary solution for starttime & endtime in average_instructor (STAFF | Instructor Appraisal | Evaluation and Average Score Analysis for Instructors)
Merge remote branch 'upstream/master'
Fixed dependent-destroy for books-accessions relationship & fixed 'duration for topic' in Topic/Lesson Plan (New/Edit/Show) pages