Change insertion icon and correct reason icon temporary.
a twitter only user can promote to a normal student user.
Change icon image temporary.
Merge branch 'master' into insert_words
Display the Sign up with Twitter link to top of the Sign up page. Localize devise default pages and mail contents.
Fix reset password mail content.
Implement ArrowWithReason plugin.
Fix arrow begin point and end point. Fix arrow curve direction.
Fix unclickable button and links.
Merge branch 'master' into arrow_with_reason
Hide arrow reason icon if has no reason text.
Implement deleting a arrow.
Can't apply multiple correction effects.
Fix delete arrow icon.
Fix can't edit arrow reason and correct reason.
ArrowFrom need to select some words.
Fix delete arrow menu label.
Add the Google Analytics script.
Fix the Google Analytics script.
Student can show only one balloon at once.