create exam category
add DS_store to gitignore
remove unecessary migration
fix ui bugs
Exam Categories
fix nil exception
route exam_categories as exams
new exam categories page
draft redtag on tests
exam categories info
install gem boosty
small layout improvement
small layout improvement
small layout improvement
performance chart
fix loggedout test bug
fix small bugs
format data on google chart
small layout improvements
small layout fixes