added Planit.Core which contains the Node class. I am experimenting with this to be the collection for our project
added dfs function to Node, doesn't work past the first depth, also added /View/Tree/Index.cshtml that displays list result, as well as TreeController
dfs now working, also commented out part of seed to fix a bug where children didn't necessarily get assigned to the correct parents
added depth functionality to node (new field and ctor), and fixed .com/tree/index so it would render depth