Macadam

1. embedding select float16, del embed, for bigram
2. add dict_sort
3. del os.environ["MACADAM_LEVEL"] = "PREDICT"
4. fix bug of install, numpy
5. fix REAMD.md, requirements.txt

1. embedding: RANDOM、WORD2VEC、MIX、BERT、ALBERT、ROBERTA、NEZHA、XLNET、ELECTRA、GPT-2
2. text-classification: FineTune、FastText、TextCNN、CharCNN、BiRNN、RCNN、DCNN、CRNN、DeepMoji、SelfAttention、HAN、Capsule
3. sequence-labeling: CRF、Bi-LSTM-CRF、CNN-LSTM、DGCNN、Bi-LSTM-LAN、Lattice-LSTM-Batch、MRC