I'm using HashMaps instead of lists

When using lists I was getting errors when I tried to insert values out
of order.
Got rid of FeedForward node.

I'm going to make child classes implement the IFeedForward interface
instead.
Added a constant
Using HashMap instead of list. Implements IFeedForward interface.
Added some tests
Deleted spacing
Deleted target directory.

I don't know how that got in there to begin with.
I think I figured out what was causing those errors before.

The bad news is that I still have some design decisions to work through.
Minor changes.