Dropping requirement for `function` keyword for methods in classes/interfaces/etc

Hi! As someone mentioned in the thread about short syntax for closures, we could also drop requirement for function keyword when defining/declaring methods in classes, interfaces or traits. I have long noticed how redundant it is. The patch is pretty easy as it was with commas :) It is absolutely backwards compatible (you can use function or you can not use it). Here's the patch: https://gist.github.com/nikita2206/4988075 If people will welcome this proposal, I would need some karma for making RFC.