Change student side correct result design to note like design.
Merge branch 'master' into update_correct_result_design
Fix free correct page design.
Merge branch 'master' into update_correct_result_design
Change corrector side correct result design to note like design. Add number to correct reason.
Add correct result popup window for taking a ScreenShot.
Fix canvas z-index.
Update correct reason(Detail of Corrects) view.
Hide correct reason if nothing.
Allow correct reason has empty explanation.
Fix twitter only user initial email uniqueness error.
Fix note line.
Fix last line arrow display.
Implement a insert correct.
Allow a empty correct phrase.
Fix the twitter correct error where client name contains whitespaces.
Fix arrow position.
Fix new line on loading.