Merge pull request #267 from nanan9177/maze_skin

Made the explosion animation to be better scheduled.
release 0.0.52
Convert individual dirt images in to a sprite sheet
Merge pull request #268 from brandonbloom/dirt-sheet

Convert individual dirt images in to a sprite sheet
Fixed rotate phone image and scrolling.
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
Changed instruction from div to p.
Corrected the unmatched p tag.
Merge pull request #271 from nanan9177/blockly_fix

Changed instruction from div to p.
Maded okayButton on show code to work with touch event.