modify DB Schema, add constraint
Create controllers for pages
Create controllers for pages
Modify html/css/js of jsp files.
Add controllers for pages.
Modify completePracticeQuestion
+ add new entities followed the updated DB
* Update relationship on User entities followed the updated DB
Normalize line endings
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/vn/jv/persist/domain/User.java
Update git attributes
Normalize line endings
Merge remote-tracking branch 'upstream/master'