#108 - show/hide root node
Merge remote-tracking branch 'origin/GH108-show-hide-root-node'

Conflicts:
	org.flowerplatform.flex_client.core/src/org/flowerplatform/flex_client/core/mindmap/renderer/NodeRenderer.as
	org.flowerplatform.flex_client.mindmap/src/org/flowerplatform/flex_client/mindmap/renderer/MindMapNodeRenderer.as
	org.flowerplatform.flexdiagram/src/org/flowerplatform/flexdiagram/mindmap/AbstractMindMapModelRenderer.as