gofmt
Modify ldflags so that it compiles for me
Prevent big memory leak of nodes

Problem now owns nodes created by Problem.Add().
If malloc fails, garbage collect and try again, then panic.
Add relative weights for each class.
Add support for bias and method to get weights
Free relative weights after training
Merge branch 'experimental'
Merge pull request #1 from jackvalmadre/master

Attempt to fix memory leak, add some functionality.