v0.3

• cythonized im2col operation
• optimized im2col operation for 1x1 convolution
• removed double precision support
• added 2 default callbacks
• fixed backward computation of softmax layer
• added binary_softmax_crossentropy, now softmax_crossentropy renamed to categorical_softmax_crossentropy

v0.2

• Added support for callback
• Removed metric history, soon will be replaced with callback
• Fixed files outside package directory

v0.1

modify setup.py to publish to pypi