Merge pull request #269 from tobyk100/master

Fixed rotate phone image and scrolling.
Add escapeHtml util.
Remove unused capacity indicator
Secure feedback messages
Secure edit code level comments
Organize utils
release 0.0.53
Merge pull request #270 from brandonbloom/i18n-flaws

I18n flaws
Translations
fix rotation image so that it doesn't appear on desktop browsers
Merge branch 'master' of https://github.com/code-dot-org/blockly
Update solutions.
Blockly drop.