Add a register-zanata-projects script

Currently, projects in Transifex are set up by hand, which requires
infrastructure members log into its admin interface and add projects.
With Zanata, we can do much better, so add a script that will parse
projects.yaml, and create any projects that are required.

This grew out of Ic28d5dcfdd471dccbe406955a85dbc6f5d7335d1, but moves
the configuration for the project from translate: true to underneath
options to match things like direct-release.

Change-Id: Id78a590ea07b886afc0c98e309ff6df45f2240bf
diff --git a/requirements.txt b/requirements.txt
index 32faa12..65d5218 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,5 @@
 pkginfo
 PyRSS2Gen
 python-swiftclient
+requests>=2.5.2
 six>=1.7.0