Including version.txt in the installed files so that supervisorctl works when easy_installed from tarball

setup.py

@@ -72,6 +72,9 @@ dist = setup(
     extras_require = {'iterparse':['cElementTree >= 1.0.2']},
     tests_require = requires + ['mock >= 0.5.0'],
     include_package_data = True,
+    data_files = [
+        ('supervisor', ['supervisor/version.txt'])
+    ],
     zip_safe = False,
     namespace_packages = ['supervisor'],
     test_suite = "supervisor.tests",