README: Convert from Markdown to reStructuredText for PyPI

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+Package-cache is a simple caching proxy for package downloads.  Just
+configure a list of upstream sources (with the ``--source`` option)
+and point clients at the package-cache server.  The first time a
+package is requested, we download that package from one of the sources
+and cache it locally, while also streaming it to the client.  Future
+requests for that package are streamed directly from the local cache.
+This helps reduce the load on the network and source servers, if you
+have a number of local clients that will repeatedly request the same
+files (e.g. `Gentoo's distfiles`_).
+
+We don't do anything fancy with `Cache-Control headers`_, since
+package source files should include the version stamp in the filename
+itself (e.g. ``my-package-0.1.2.tar.gz``).  Files are cached after the
+first request, and stored forever.  This means that every package
+you've ever requested will still be there if you need it later.
+That's nice, but it will end up consuming a fair amount of disk space.
+You might want to periodically cull the cache, using access times to
+see which files you are unlikely to want in the future.
+
+Package-cache is written in Python, and has no dependencies outside
+the standard library.
+
+Running package-cache
+=====================
+
+By default, we'll use `Python's reference WSGI implementation`_ to run
+our application::
+
+  $ package-cache --source http://distfiles.gentoo.org/
+
+For other command-line options, see::
+
+  $ package-cache --help
+
+If you need a more perfomant backend, you might try Gunicorn_.
+
+.. _Gentoo's distfiles:
+  https://wiki.gentoo.org/wiki/Project:Infrastructure/Source_mirrors
+.. _Cache-Control headers:
+  https://tools.ietf.org/html/rfc2616#section-14.9
+.. _Python's reference WSGI implementation:
+  http://docs.python.org/3/library/wsgiref.html
+.. _Gunicorn:
+  http://gunicorn-docs.readthedocs.org/en/latest/run.html#gunicorn

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-Package-cache is a simple caching proxy for package downloads.  Just
-configure a list of upstream sources (with the `SOURCES` environment
-variable) and point clients at the package-cache server.  The first
-time a package is requested, we download that package from one of the
-sources and cache it locally, while also streaming it to the client.
-Future requests for that package are streamed directly from the local
-cache.  This helps reduce the load on the network and source servers,
-if you have a number of local clients that will repeatedly request the
-same files (e.g. [Gentoo's distfiles][distfiles]).
-
-We don't do anything fancy with [Cache-Control
-headers][Cache-Control], since package source files should include the
-version stamp in the filename itself (e.g. `my-package-0.1.2.tar.gz`).
-Files are cached after the first request, and stored forever.  This
-means that every package you've ever requested will still be there if
-you need it later.  That's nice, but it will end up consuming a fair
-amount of disk space.  You might want to periodically cull the cache,
-using access times to see which files you are unlikely to want in the
-future.
-
-Package-cache is written in Python, and has no dependencies outside
-the standard library.
-
-[distfiles]: https://wiki.gentoo.org/wiki/Project:Infrastructure/Source_mirrors
-[Cache-Control]: https://tools.ietf.org/html/rfc2616#section-14.9