big doc update [WIP]

docs/source/main_classes/configuration.rst

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+Configuration
+----------------------------------------------------
+
+We provide a base class, ``PretrainedConfig``, which can load a pretrained instance either from a local file or directory or from a pretrained model configuration provided by the library (downloaded from HuggingFace AWS S3 repository).
+
+``PretrainedConfig``
+~~~~~~~~~~~~~~~~~~~~~
+
+.. autoclass:: pytorch_transformers.PretrainedConfig
+    :members:

docs/source/main_classes/model.rst

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+Models
+----------------------------------------------------
+
+``PreTrainedModel``
+~~~~~~~~~~~~~~~~~~~~~
+
+.. autoclass:: pytorch_transformers.PreTrainedModel
+    :members:

docs/source/main_classes/optimizer_schedules.rst

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+Optimizer
+----------------------------------------------------
+
+``AdamW``
+~~~~~~~~~~~~~~~~
+
+.. autoclass:: pytorch_transformers.AdamW
+    :members:
+
+Schedules
+----------------------------------------------------
+
+.. autoclass:: pytorch_transformers.ConstantLRSchedule
+    :members:
+
+.. autoclass:: pytorch_transformers.WarmupConstantSchedule
+    :members:
+
+.. autoclass:: pytorch_transformers.WarmupCosineSchedule
+    :members:
+
+.. autoclass:: pytorch_transformers.WarmupCosineWithHardRestartsSchedule
+    :members:
+
+.. autoclass:: pytorch_transformers.WarmupLinearSchedule
+    :members:

docs/source/main_classes/tokenizer.rst

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+Tokenizer
+----------------------------------------------------
+
+``PreTrainedTokenizer``
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. autoclass:: pytorch_transformers.PreTrainedTokenizer
+    :members: