[Module-build-general] More version info in META.yml

[<sc...@po...>]

I was talking with Andreas last night about the META.yml idea.  He mentioned
that it would be useful for PAUSE if in addition to having just the
version # for the whole distribution, it also had the version # for all
.pm files in the dist.  That way PAUSE wouldn't have to check itself
(involving some gymnastics to make it safe).

At our end, its pretty simple.  We just run the moral equivalent of
ExtUtils::MakeMaker->parse_version on each .pm file and encode that,
something like:

modules:
	Module::Build:		0.16
    	Module::Build::Base:
	Module::Build::Compat:	0.02
	...etc...

Thoughts?