Add support to build docs by Sphinx

The patch introduce configuration files for building documentations by
Sphinx. Also added a simple tree of static documents for test ability of
autobuilding documentation from source code.

bp rally-sphinx-docs

Change-Id: I2a225b1bdb4ae0640428b438a0c9779e28586546

doc/source/index.rst

@@ -0,0 +1,45 @@
+..
+      Copyright 2014 Mirantis Inc. All Rights Reserved.
+
+      Licensed under the Apache License, Version 2.0 (the "License"); you may
+      not use this file except in compliance with the License. You may obtain
+      a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+      WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+      License for the specific language governing permissions and limitations
+      under the License.
+
+Welcome to Rally's documentation!
+=================================
+
+Rally is a benchmarking tool for the community that is capable of performing
+specific, complex and reproducible tests for real deployment scenarios.
+
+
+Source Documentation
+====================
+
+Contents:
+
+.. toctree::
+   :maxdepth: 3
+
+   database
+   deploy
+   benchmark
+   provisioning
+   objects
+   cmds
+   osclients
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`