First off, thanks for a great gem - i'm finding it really useful to work with scientific ontologies! :)

One really cool feature that I think is missing though - and would be most useful if possible (if you have any ideas
on how to implement it) would be to be able to merge two separate trees.

Obviously they would have to share the same root node for this to be possible at all...

I'm trying to work on this myself, but if you have any ideas or plans for this i'd be most appreciative of any input
guidance. :)

Thanks,

Darren