Added support for less, dynamic stylesheet language and some post processing Jekyll plugins to minify generated files.

- Adding support for less stylesheet language to make management of CSS stylesheets easier.
- Adding support for jekyll-press to minify JavaScripts, HTML and CSS generated files as a post processing step to reduce page loading times.

Following Ruby gems should be installed aside Jekyll in order to use new features: less, therubyracer and jekyll-press.