This commit removes the behavior that width and height of a viewer are
automatically set to 100% unless specified otherwise.
The width and height are now optional attributes, that are only applied
if given. This way, users may still style their elements via CSS.
The project logo now properly embeds in the Viewer and links to bpmn.io.
This way, we are able to ship it as part of a bpmn-js bundle.
In addition to that change this commit upgrades to the latest diagram-js
release, too which adds support for Diagram#destroy().
Closes#15
jdotzki
Nico Rehwaldt
Nico Rehwaldt