added new error: File not found.
added two new keys to the config file:
* minify_js and minify_css

added some comments
set default of minify_js and minify_css to false (even if not explicitly
set in config file)
Grace - build

* Added JS minify if key is set in config file
* Added CSS minify if key is set in config file

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
Setup

Added slimit and rcssmin modules to requirements

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
Increased Version

Signed-off-by: Michael Diener <dm.menthos@gmail.com>