Add gerritx project infrastructure.

Add all of the support files needed for this to be a project.
Also, fix pep8 and pyflakes errors.
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..349b889
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,8 @@
+include gerritx/versioninfo
+include AUTHORS
+include ChangeLog
+
+exclude .gitignore
+exclude .gitreview
+
+global-exclude *.pyc