Merge pull request #58 from tgrrtt/develop

Implemented addNode
drop on RR diagram reverts the diagram, drop off results in a removal of the node
copy appends close to target, but not quite
selects additional node types, smooths removal
Merge pull request #59 from TessMyers/develop

drag and drop a little chunky, but can drag off other groups now
Implemented basic treeToInput