Initial commit based on current tempest

This creates the tempest plugin for horizon and duplicates
the existing horizon scenario test in tempest.

Change-Id: I9430b6cefc884ecc105e91ec19a07987aa70ef98
diff --git a/doc/source/index.rst b/doc/source/index.rst
new file mode 100644
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+.. tempest-horizon documentation master file, created by
+   sphinx-quickstart on Tue Jul  9 22:26:36 2013.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to tempest-horizon's documentation!
+========================================================
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   readme
+   installation
+   usage
+   contributing
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+