Added support for data-driven entity-names in Metamorph:

Usage:
<entity>
	<entity-name>
		<data source="inp">
	</entity-name>
	<data source="content">
	<data source="moreContent">
</entity>
Visualizer outputs entity-name correctly.
Use collect stack to access entity instead keeping a reference.
Reset name to default on reset.
Merge pull request #65 from cboehme/entity-name

Added support for data-driven entity-names in Metamorph: