Users guide.

Users guide.

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rename : docs/early_binding_for_speed.rst => src/userguide/early_binding_for_speed.rst
rename : docs/extension_types.rst => src/userguide/extension_types.rst
rename : docs/external_C_code.rst => src/userguide/external_C_code.rst
rename : index.rst => src/userguide/index.rst
rename : docs/language_basics.rst => src/userguide/language_basics.rst
rename : docs/limitations.rst => src/userguide/limitations.rst
rename : docs/numpy_tutorial.rst => src/userguide/numpy_tutorial.rst
rename : docs/overview.rst => src/userguide/overview.rst
rename : docs/profiling_tutorial.rst => src/userguide/profiling_tutorial.rst
rename : docs/pxd_package.rst => src/userguide/pxd_package.rst
rename : docs/pyrex_differences.rst => src/userguide/pyrex_differences.rst
rename : docs/sharing_declarations.rst => src/userguide/sharing_declarations.rst
rename : docs/source_files_and_compilation.rst => src/userguide/source_files_and_compilation.rst
rename : docs/special_methods.rst => src/userguide/special_methods.rst
rename : docs/tutorial.rst => src/userguide/tutorial.rst
rename : docs/wrapping_CPlusPlus.rst => src/userguide/wrapping_CPlusPlus.rst