Merge pull request #121 from tobyk100/master

Remove readline and pry mess since the both create issues in various env...
log user_agent in milestone.log
allow onHidden callback for Dialog
Merge branch 'master' of github.com:code-dot-org/dashboard
Translations
Send level specific feedback to blockly.
Merge pull request #122 from nanan9177/blockly_fix

Send level specific feedback to blockly.
Added one level.
Merge pull request #123 from nanan9177/tutorial

Added one level.
Added messages for ie8, non supported and i18n.