Implemented #1372: Test concatenation of more types of layers in FlattenerLayer. It now includes test for linear, softmax, sigmoid and convolutional layers.
Implemented #1372: Test concatenation of more types of layers in FlattenerLayer. It now includes test for linear, softmax, sigmoid and convolutional layers.

matrogers/pylearn2,matrogers/pylearn2,matrogers/pylearn2,matrogers/pylearn2