Add a reference
PA4: Init (Neural Network Learning Week 5)
PA4: Feedforward and Cost Function (Regularized)
PA4: Finished (Backpropagation)
PA3: Init interface
PA3: Passed (Baseball Elimination)
Fixed 404 link
Merge remote-tracking branch 'origin/Algorithms'

Conflicts:
	README.md
Merge branch 'MachineLearning'