Version 0.4.0

• Embedding backward
• Momentum
• NesterovMomentum
• Adagrad
• RMSprop
• Adadelta
• Adam
• Adamax

Version 0.3.0

• support LSTM
• support GRU
• add all tests
• add seq2seq chatbot application

Version 0.2.0

• add more layers, such as batch normalization, shape layer
• provide more perfect tutorials
• provide more detaied API comments

Version 0.1.0

Merge pull request #8 from oujago/develop

fix test bug