Merge branch 'release-6.0.0' into develop
Merge branch 'release-6.0.0' into develop
Merge branch 'master' into develop
remove redundant upgrade log
remove redundant ripple config
remove bad nunit references
add InternalsVisibleTo for NServiceBus.Azure.Tests
fix wrong key in InternalsVisibleTo
Dont store Timespan in ValidUntil

Fixes #178

also added some unit tests which illustrate some other bugs
fix spelling
force UTC output
fix tests to match UTC changes
split out tests to verify progressive upgrades
move over to DateTimeExtensions.ToWireFormattedString
fixed duplicate nunit reference
Merge branch 'ValidUntil'