Merge branch 'reimplement/model_object' into 'master'

combo/common/util.py

combo/data/__init__.py

combo/data/dataset.py

combo/data/dataset_readers/dataset_reader.py

combo/data/fields/adjacency_field.py

combo/data/fields/metadata_field.py

combo/data/fields/sequence_label_field.py

combo/data/tokenizers/__init__.py

combo/data/tokenizers/whitespace_tokenizer.py

combo/models/__init__.py

combo/models/base.py

combo/models/combo_model.py

combo/models/embeddings.py

combo/models/encoder.py

combo/models/model.py

combo/models/parser.py

combo/modules/augmented_lstm.py

combo/modules/input_variational_dropout.py

combo/modules/seq2seq_encoder.py

combo/nn/initializers.py