fixes #1384 prevent xss attack in app title, also did a first pass of where we can use textContent in place of innerHTML
Updats to bundles
Bundling popcorn.js
fixes #1689 editable checkbox style fix
Garbage icon deletion fix

1. Added detached function to ceci-element-designer.
2. attached/detached use bound cleanup function to do element removal.
Merge pull request #1709 from secretrobotron/t1708

Garbage icon deletion fix
Re-bundling
Merge branch 'develop' of github.com:mozilla-appmaker/appmaker into develop
Merge pull request #1666 from ScottDowne/t1384

fixes #1384 prevent xss attack in app title, also did a first pass of wh...
swapped "App URL" for "Preview App"
Merge pull request #1707 from ScottDowne/t1689

fixes #1689 editable checkbox style fix
Merge pull request #1718 from Pomax/t1699

swapped "App URL" for "Preview App"
made hidden more important
Merge pull request #1721 from Pomax/t1715

made hidden more important
Menu Icons

1. Removed strict gettext checking from grunt (should add again later).
2. Used filter for l10n in user-state.
3. Fixed locale strings in msg.json.
4. Added font-awesome icons for app menu options.
removed gettext_finder from default grunt tasks
Merge pull request #1681 from secretrobotron/menu-icons

Menu Icons
Cleaned up tray categories.

1. Implemented category descriptions.
2. Switched around category names and placed bricks as appropriate.
3. Used l10n.