Now Loss layers would return the loss in the top blob if requested
Modified test_net to check loss layer with top
Now AccuracyLayer only computes accuracy, one should use LossLayers to compute loss
Changed all val.prototxt in examples to add a LossLayer to compute loss in Test
fix SOFTMAX_LOSS to work with loss top blob interface
file SoftmaxWithLoss in with loss layers
Merge pull request #522 from sguada/accuracy_without_loss

Split accuracy and loss