Added v-model and removed slot

[jaybeecave]

not sure if removing slot is the only way forward, but i dont think it makes sense to have both slot and v-model and I think the most common use case would be hooking the editor to a model or binding it somehow.

I toyed with the idea of having the slot be a default value, but this may be more confusing that its worth, as how do you know when to apply that default value. (i.e. a blank value could be a use case for replacement with default, but then again a blank value could be a valid value....)

Hope that makes sense

Thanks