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Update User Guide and move up to Linaro 16.02

This patch updates the TF User Guide, simplifying some of the steps
to build and run TF and trying to avoid duplicated information that
is already available on the ARM Connected Community or the Linaro
website.

The recommended Linaro release is now 16.02.

Change-Id: I21db486d56a07bb10f5ee9a33014ccc59ca12986