Move old documentation out of the way

old/docs/api.rst

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+==========
+Flake8 API
+==========
+
+.. module:: flake8
+
+flake8.engine
+=============
+
+.. autofunction:: flake8.engine.get_parser
+
+.. autofunction:: flake8.engine.get_style_guide
+
+flake8.hooks
+============
+
+.. autofunction:: flake8.hooks.git_hook
+
+.. autofunction:: flake8.hooks.hg_hook
+
+flake8.main
+===========
+
+.. autofunction:: flake8.main.main
+
+.. autofunction:: flake8.main.check_file
+
+.. autofunction:: flake8.main.check_code
+
+.. autoclass:: flake8.main.Flake8Command
+
+flake8.util
+===========
+
+For AST checkers, this module has the ``iter_child_nodes`` function and
+handles compatibility for all versions of Python between 2.5 and 3.3. The
+function was added to the ``ast`` module in Python 2.6 but is redefined in the
+case where the user is running Python 2.5