Add IO::All but chop out the guessing about what it is.  Only work with
files and leave everything else to be explicit.

Also add io->url() for opening URLs.
Merge branch 'master' into io-all

Conflicts:
	lib/perl5i.pm
Merge branch 'io-all' of github.com:notbenh/perl5i

Conflicts:
	Build.PL
	lib/perl5i.pm