Add top-level spma.pod file

Add top-level spma.pod file back in that references spma::yum and
spma::ips.
Add AUTHOR
Minor update for spma::yum submodule

Reference spma::yum now as this is no longer the top-level module.
Also, 'packager' might be other values, but 'yum' will trigger this
module.
Module is now called NCM::Component::spma::yum