Minimize CSS

[php-coder]

Useful links:

• https://developers.google.com/speed/docs/insights/MinifyResources
• https://code.google.com/p/wro4j/wiki/MavenPlugin
• http://samaxes.github.io/minify-maven-plugin/
• http://alchim.sourceforge.net/yuicompressor-maven-plugin/