Added config option to suppress NameIDPolicy from AuthnRequest
Tabs -> spaces
Fixed missing logout message ID
Make NameIDPolicy optional in AuthRequest  aerialship/lightsaml#22
Added metadata exchange step

I had trouble working out where to download the SP metadata from.
fix service configuration merge causing loss of service names
set provided Request on SpProvider, fixes missing request exception when no base_url is provided
Update README.md
Update failure.html.twig
Merge remote-tracking branch 'tamlyn/master'

Conflicts:
	composer.lock
	src/AerialShip/SamlSPBundle/Bridge/LogoutReceiveRequest.php
	src/AerialShip/SamlSPBundle/DependencyInjection/Security/Factory/SamlSpFactory.php