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).
Merge pull request #186 from eestrada/master

Changed getNodeInfo function to anticipate scene files & Added new lockAsset function