Speeds up precision minification.
Speeds up precision minification.

* Caches minification regexp.
* Skips minification if no decimal dots in value.

yomed/clean-css,webconnex/clean-css,stuht/clean-css,island205/clean-css,MartyIX/clean-css,jakubpawlowicz/clean-css,HossainKhademian/CleanCss,shelsonjava/clean-css,scottgonzalez/clean-css,vlajos/clean-css,GerHobbelt/clean-css