Text shader works. Upside down.
Merge branch 'master' of https://github.com/DynamoDS/helix-toolkit into ianMaster
Merge pull request #5 from Benglin/master

Updated billboard pixel shader to deal with alpha channel
Change winding on UVs
Disable hit testing for billboard text.
Merge branch 'master' of https://github.com/DynamoDS/helix-toolkit into ianMaster
Merge branch 'master' of https://github.com/DynamoDS/helix-toolkit into ianMaster