Slightly change invoke_mason method for easier reuse
skip MYMETA files from MANIFEST

Manifest tests complaint otherwise and these files
never should be shipped to CPAN.
@Git should be after NextRelease

Because of Git::Commit and it is documented in
the plugin's docs.
replace dist::zilla's deprecated plugins
replace dzil's BumpVersionFromGit with Get::NextVersion

The former is deprecated
fix Changes file

0.52 release was never placed into Changes, copy date from CPAN.
undef $writer to avoid a memory leak

If we don't do this we leak CGI::PSGI instance per
request and other object referenced by it, but
only if plack's response_cb util is used.

I couldn't unwrap everything to find particular
reason of the leak, but this change helps. Test
proves that module leaks without the change and
doesn't leak with.
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'ruz/leak'

Conflicts:
	Changes