adding what I got so far
Merge remote branch 'upstream/master' into HouRoll
added rollback
Adding Houdini Rollback tool. Also a few changes to checkout in Houdini.
Adding the lighting_asset misc changes.
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Merge pull request #31 from cdwasden/master

Houdini Rollback
Added Checkin
Merge pull request #32 from nstandif/master

Rollback Still Broken, but checkout / checkin / discard working
added static alembic export