Merge pull request #1 from Benglin/master

Initial implementation of billboard text support
More BillboardText3D implementation.
Add bitmap font loading in BillboardText3D constructor.
Merge branch 'master' of https://github.com/DynamoDS/helix-toolkit into ianMaster

Conflicts:
	Source/HelixToolkit.Wpf.SharpDX/Model/Elements3D/BillboardTextModel3D.cs