WIP lesscss integration. #112

don't comment on surrounding changes (config & autoloader). i just wanted this branch to be testable out of box
You mean instead if having $this->parsed i should just store $this->lastModified?

the above logic works like this:
1. get lessphp cache structure from minify cache
2. let lessphp validate the cache and rebuild it if invalid

result is that $cache always contains fresh content

please see how lessphp handles this: http://leafo.net/lessphp/docs/#compiling_automatically