#73 Add unique key to studentquiz_progress to ensure data consistency
#73 manual migration
#72 Performance optimization: Don't load all attempts on start
Merge branch 'HuongNV13-wip296757' into develop4
Merge branch 'HuongNV13-wip296761' into develop4
Merge branch 'wip296761' of git://github.com/HuongNV13/moodle-mod_stu… …
Fixed issue with deprecated step in behat test and replaced it.
Enhancement: Ranking to include ‘Anonymised’ in block title if activi… …
Changed pgsql version from 9.3 to 9.4
Removed php version 5.6
Added moodle version 3.6 to travis
Minor performance optimization with manual caching
Performance optimization of view.php