checking in a lighting file now deletes the backup folder that is automagically created by houdini
Merge pull request #185 from bkingery/master

Delete houdini backup folder on lighting checkin
Changed getNodeInfo function to anticipate scene files

It doesn't yet DO anything with that information (just prints an
error message), but the structure is there.
Added new lockAsset function

However, we still default to the old lockAsset function for now.
We will do more testing before we switch over (IF we switch over).