Rename WixRollbackBoundary table to WixBundleRollbackBoundary.
Rename Facades property on commands to PackageFacades.
Merge pull request #53 from robmen/binder-bundle-renames

Incorporate feedback from Binder bundle renames
Fix BA manifest parsing when DisplayInternalUI is absent.

DisplayInternalUI is only present on MSI and MSP packages. The code
assumed it was always present (which it may have been but should not
have been).