Use beforeAnnotationCreated in dev.html

instead of the deprecated annotationData option.
Document plugin should init member vars in init
Wean Document plugin off Annotator.Plugin

Still using pluginInit. Add a destroy.

We should decide what to do with these.
Remove unnecessary fat arrows in document plugin
Tag plugin doesn't need Annotator.Plugin
Wean Auth off Annotator.Plugin

This one was :cake: