Document new development location

Update the README with information about how to access the correct
development repository and get set up to contribute patches.

Addresses the redirect request in issue #11

Change-Id: I642334318e42f11d00c258755d8fcbd5aabd8dac

README

@@ -1,27 +1,27 @@
-The lockfile package exports a LockFile class which provides a simple API for
-locking files.  Unlike the Windows msvcrt.locking function, the fcntl.lockf
-and flock functions, and the deprecated posixfile module, the API is
-identical across both Unix (including Linux and Mac) and Windows platforms.
-The lock mechanism relies on the atomic nature of the link (on Unix) and
-mkdir (on Windows) system calls.  An implementation based on SQLite is also
-provided, more as a demonstration of the possibilities it provides than as
-production-quality code.
+==============================
+  Contributing to pylockfile
+==============================
 
-Note: In version 0.9 the API changed in two significant ways:
+The pylockfile library has been adopted by the OpenStack Oslo program,
+and development is now managed using our regular tool chain.
 
- * It changed from a module defining several classes to a package containing
-   several modules, each defining a single class.
+If you would like to contribute to the development of OpenStack,
+you must follow the steps in the "If you're a developer, start here"
+section of this page:
 
- * Where classes had been named SomethingFileLock before the last two words
-   have been reversed, so that class is now SomethingLockFile.
+   http://wiki.openstack.org/HowToContribute
 
-The previous module-level definitions of LinkFileLock, MkdirFileLock and
-SQLiteFileLock will be retained until the 1.0 release.
+Once those steps have been completed, changes to OpenStack
+should be submitted for review via the Gerrit tool, following
+the workflow documented at:
 
-Available on GitHub from:
+   http://wiki.openstack.org/GerritWorkflow
 
-    git://github.com/smontanaro/pylockfile.git
+If you would like to fork or clone the repository from GitHub, please
+use https://github.com/openstack/pylockfile instead of this
+repository.  However, pull requests submitted through GitHub will be
+ignored.
 
-To install:
+Bugs should be filed on Launchpad, not GitHub:
 
-    python setup.py install
+   https://bugs.launchpad.net/pylockfile