Test for push classes

Signed-off-by: Jérôme Coupé <jercoupe@gmail.com>
Added support for push and pull classes

* made all silent %classes explicit instead of being computer generated
* added support for pull classes
* added support for push classes
* added JS scripts for IE8 compatibility

Signed-off-by: Jérôme Coupé <jercoupe@gmail.com>
Path corrected for usage as local files (no domain)

Signed-off-by: Jérôme Coupé <jercoupe@gmail.com>
Improved comments and variable names

* Better comments in SASS and HTML files
* Sensible variable names and defaults

Signed-off-by: Jérôme Coupé <jercoupe@gmail.com>