moved the config method from the base command to the app

because the app will need access to config information
-	(and this makes better sense anyway)
this was surprisingly easy, actually, thanks to Moose's attribute extensions
-	just picked up the attribute itself and moved it
-	picked up the builder and moved it
-	then added an attribute extension in the base command for `handles` to delegate config() back to the app
-	and, voila, that was pretty much it