add x-gif component
remove unnecessary files
add thumbnail.gif
add setSource listern and src attribute for ceci-definition
add method setSource
Use compiled+minified jquery-ui CSS file.

This saves ~20 HTTP requests.
Merge pull request #2300 from mozilla-appmaker/jquery-ui-css

Use compiled+minified jquery-ui CSS file.
Merge pull request #2283 from marti1125/x-gif

x-gif
Convert designer/js/utils to commonjs

* converted the utils lib to commonjs module format from requirejs.
* replaced the implementation of `getQueryStringVariable` with a version
based on `querystring` from the node standard library.
* started a test suite.
Convert designer/js/togetherjs to commonjs
Fix leaky variable, typo'd variable name.
Convert designer/js/publishPane
Convert designer/js/editable
Convert designer/js/keyboard
Convert designer/js/modes
Convert designer/js/debugger
Convert designer/js/click
Remove unnecessary files from vendor/jquery-ui
Remove unnecessary files from vendor/colorpicker
Convert designer/js/channels