* Work on API reference

docs/source/api.rst

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+===============
+API Reference
+===============
+
+spaCy provides a number of text-processing components, which can be arranged
+into text-processing pipelines.  The pipeline should first construct a Tokens
+object, which will then be enhanced with various information by subsequent
+components.  Access is then 
+
+Most users will want to use a pre-prepared pipeline for a given language.  This
+page first lists these pipelines and their relevant APIs, before listing the
+APIs for the individual components.
+
+English Pipeline
+----------------
+
+The spacy.en package exports a single class, English, and several constants,
+under spacy.en.defs.
+
+.. autoclass:: spacy.en.English
+   :members:  
+
+.. autommodule:: spacy.en.pos
+   :members:
+
+The Tokens Class
+----------------
+
+
+.. autoclass:: spacy.tokens.Tokens
+   :members:
+
+.. autoclass:: spacy.tokens.Token
+   :members:
+
+Generic Classes
+---------------
+
+.. automodule:: spacy.vocab
+   :members:
+
+.. automodule:: spacy.tokenizer
+   :members:
+
+.. automodule:: spacy.tagger
+   :members:
+
+.. automodule:: spacy.syntax.parser
+   :members:
+
+Utility Functions
+-----------------
+
+.. automodule:: spacy.orth
+   :members:
+
+