Clarify and document required/supported libraries

at least until #490 is completed.

consumers can decide whether or not to include it in their app depending on the version of jquery they are using

Also, use a greater than instead of a tilde for defining the jquery requirement.
> By "our distribution", do you mean the concatenated jquery.wymeditor.js and the minified jquery.wymeditor.min.js?

> So, you mean that we should concatenate it at the start of that?

I believe so, yes, just as we do with rangy. Does that make sense to you? It keeps the install simple, which still giving folks the flexibility to use their current version of jQuery (which is often very difficult to change).