Make typeSelector optional for ChangeFactory.
Make typeSelector optional for ChangeFactory.

A default type selector can now be used, which just grabs the change's
type without any actual selection process.  This can be used as a
default behavior, especially for use by automated processes.  In that
case, they would likely just be using the default "Minor Features"
change type.

nubs/release-notes,guywithnose/release-notes,guillermoandrae/release-notes