when use_ext is true, a fatal error will be thrown if there are no loaders available that understand the file extension

Files:
modified: /branches/Config-Any/unsupported_error/Changes (try)
modified: /branches/Config-Any/unsupported_error/t/10-branches.t (try)
added: /branches/Config-Any/unsupported_error/t/64-extfail.t (try)
modified: /branches/Config-Any/unsupported_error/lib/Config/Any.pm (try)