Bump version to 6.0.0-*
refactor of action descriptor pipeline

(cherry picked from commit 634f756e7fd303fc3022563fcd8fb9b1cb47fba2)
Updating release Nuget.config
Updating dev Nuget.config
Update controller methods to be all virtual
Fix #596
ActionDescriptor.Parameters is not populated by provider
Merge branch 'release' into dev
Adding support for ActivateAttribute via IControllerActivator

This mechanism replaces code in Inject that activated properties
by looking them up by names.
Fixing the TODOs dependent on SimpleDisplayText.
Catch MVC up with Helios rename
- allows builds to succeed after cleaning your repo (without NuGet.org source)
Merge branch 'release' into dev
Catch MVC up with Helios rename
- one more file to change on dev branch
Add Autofac functional test.

Added very simple Autofac functional test that validates that we can add custom classes to the DI system as well as just use the ones provided to us.

#669
Revive ModelMetadata.ShowForDisplay and ModelMetadata.ShowForEdit

Fixes #679
Reacting to HttpAbstractions changes