Use %placeholder for streching examples.
Fixes #1600 - Invalid path returned by sprite_file

When specifiying a generic_images_dir sprite_file would return the wrong
path to the original image because this was relative to the generic_
images_path instead of the images_path.
Use the new Sass-based watcher and compiler.
Prettier happy styling message
Support user watches via the Sass watcher.
Add this callback for parity/completeness
Support only compiling specific sass files.
Remove the dry run option.
Deprecated the old Compass::Compiler
Remove the old watching infrastructure.
Fix failing tests
Evidently Method#to_proc doesn't work the way I think it does in all rubies.
Fix broken cukes
Sass 3.4 sourcemap support
The api for public_url has changed in sass 3.4.
Build is green on rubinius now. Let's keep it that way.
bump version to 1.0.0.rc.0
Bump sass requirement.
Update caniuse data.
Update CHANGELOG