Added support for background-size property in chance spriting, this is required for spriting to work properly in retina firefox
Adds more helper text to statechart_app Buildfile

Copy changes to 'app' generator over to 'statechart_app' generator. Mirrors
changes in commit 5cda3e03fae6f3c0bba5ac9fb09f79ed6aeaf675.
Adds spec for SC::Generator#snake_case
Fixes bug in SC::Generator#snake_case
Merge pull request #97 from ianejames/statechart_app_buildfile

Adds more helper text to statechart_app Buildfile
Merge pull request #98 from ianejames/snake_case

Fix bug in SC::Generator#snake_case
Merge pull request #95 from learndot/master

Added support for moz-background-size and background-size to retina spriting.
Adds a default CSS file to match the page file when using design generator.
Replaces old responder generator with updated state generator.
Fixes 'repeat' slice for @2x version.  It was incorrectly appending @2x to the end of the whole path (ex. /resources/images/image-sliced-from.png@2x instead of /resources/images/image-sliced-from@2x.png).
Softens the dependency requirements from being ultra-pessimistic (i.e. within a minor version) to being pessimistic (i.e. within a major version).  Closes #94.
Updates the VERSION to 1.9.2.
Bumps SC to 1.9.2 release.