Move DD code into its own directory (#6)

reference/docs/web_integrations.rst

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+Web Frameworks
+--------------
+
+``ddtrace`` provides tracing support for many Python web frameworks. For each
+framework ``ddtrace`` supports:
+
+- tracing of requests [*]_: trace requests through middleware and back
+- distributed tracing [*]_: trace requests across application boundaries
+- automatic error tagging [*]_: spans will be marked with any errors that occur
+
+.. [*] https://docs.datadoghq.com/tracing/
+.. [*] https://docs.datadoghq.com/tracing/faq/distributed-tracing/
+.. [*] "erroneous HTTP return codes" are defined as being greater than 500
+
+.. _aiohttp:
+
+aiohttp
+^^^^^^^
+
+.. automodule:: ddtrace.contrib.aiohttp
+
+
+.. _bottle:
+
+Bottle
+^^^^^^
+
+.. automodule:: ddtrace.contrib.bottle
+
+.. _djangorestframework:
+.. _django:
+
+Django
+^^^^^^
+
+.. automodule:: ddtrace.contrib.django
+
+
+.. _falcon:
+
+Falcon
+^^^^^^
+
+.. automodule:: ddtrace.contrib.falcon
+
+
+.. _flask:
+
+Flask
+^^^^^
+
+
+.. automodule:: ddtrace.contrib.flask
+
+.. _molten:
+
+Molten
+^^^^^^
+
+.. automodule:: ddtrace.contrib.molten
+
+.. _pyramid:
+
+Pyramid
+^^^^^^^
+
+.. automodule:: ddtrace.contrib.pyramid
+
+
+.. _tornado:
+
+Tornado
+^^^^^^^
+
+.. automodule:: ddtrace.contrib.tornado
+