Revert "set mb_version to 0.28 for MBT::Fallback as well (it has-a, not is-a, [MB])"

This reverts commit 37007f078758138742aa666cdf716cacf9d42a73.
...because it was absolutely pointless.  MBT:F already sets mb_version,
itself, starting with version 0.005
switch from [EOLTests] to [Test::EOL]
add "demo" to MetaNoIndex too
ensure all bundle tests swap out $ENV{USER}, to avoid [VerifyPhases]

e.g.
http://www.cpantesters.org/cpan/report/85ae55ce-58cd-11e4-91e1-c08ca1d7e820
tweak configs for [GithubMeta] to ensure the issue tracker is not added to metadata
Dist-Zilla-PluginBundle-Author-ETHER-0.077

          - switch from [EOLTests] to [Test::EOL]