tried setting the add dialog's css but that doesn't seem to change it; so wrap it in a custom div so we can style the modal that way
fixed bug in editor #123 where we were not using the XML document to create elements - so camelCase elements were being turned into lowercase - causing all kinds of issues ;)
#123 selecting a component now adds an endpoint node to the diagram (doesn't yet pass along the schema or the data for the properties editor yet)