pass arguments to compiler

[aeosynth]

I'd like to pass arguments to the compiler, so that users can configure / compile their own css through a web interface. stylus allows this with the define method of its javascript api, but it's rather awkward imo.

essentially, I want to make a better userstyles.org.

[jonschlinkert]

#1134

[lukeapage]

(I think) This is different from #1134 - you can pass arguments by setting options on the less object (now documented) but I don't see why you shouldn't be able to set options per session / in a better way

[lukeapage]

I am not sure I 100% understand. I hope its covered by 1134 though, so closing.