Document how to include the file processed by PathRewriterPlugin

[AndrewRayCode]

Right now it is not clear how PathRewriterPlugin is supposed to access the files it touches. Are you supposed to require() the files? Are you supposed to add them as an entry point?

[skozin]

Yeah, this really needs documenting. I'll leave this issue opened until it is done. For now, please see this for an example of basic usage (I've added it just now).