change git link to public git
mention more authors
update MANIFEST.SKIP so `make manifest` works
remove META.yml as MakeMaker generates it for us

EU::MM generates META.* files during `make dist`, generated
files end up in the tarball, not in repo directory, so there
is no way to track them with version control system.

MANIFEST is updated automatically during the same step.
bump version, 1.48