Doc: Updated for Version 1.0-RC1

This patch updates the documentation landing
page (readme.rst) to reflect the latest
release (Version 1.0-RC1).

* Updated Sphynx documentation version tags
* Updated Doxygen documentation version tags
* Updated features/capabilities described in readme.rst

Change-Id: I273127e18b21e1c71feb140215f80a9826c0e0df
Signed-off-by: Galanakis, Minos <minos.galanakis@arm.com>