Removes fuel less package folder and files
Changes fuel less package to be a submodule
Changes less config for output dir to use casset public static method
Removes overriding casset package
Adds a casset config for production with optimizations
Removes old unsupported less package configs
Adds new cache path to casset and less package configs
Merge pull request #19 from dmyers/less-submodule

Changes less package to be a submodule.