Removes pre-filled textarea of HTML about wysihtml5

[wvl]

You need to pass in the parser rules that match the tags you expect to see and allow. The only tags allowed by default are (br, span, div, and p). See the simple example for a set of parser rules.

[danharper]

Ah, of course! Thank you :)

[tiff]

Thanks @wvl for pointing this out! :)
I'll write a better guide on how to implement and use the editor.