Properly require Locale::TextDomain 1.20.

So that it will be picked up by AutoRequires.
Start adding l10n infrastructure.

Language files are in the `po` directory. The Makefile there can be used
to update them. New ones can be created by copying `App-Sqitch.po` and
adding the new language code to `PACKAGE`.

We set the locale in the scripts so that Text::LocaleDomain knows where what
language to use when Sqitch runs.
Exclude po directory from distribution.
Get po-file generation working.

Done for French and German; removed most of the strings to translate for testing puproses. Also updated the pot file generation to put int most of the proper default headers and values.
Increment l01n files to v0.931.
Update po files.
Add LocaleTextDomain plugin support.
Remove mo-based rules from Makefile and update .po files.
Update POT file using `dzil msg-scan`.
s/david/marge/g
Fix mis-named bundle option --dest-dir.
Remove po Makefile.

Will use the the Dist::Zilla::Plugin::LocaleTextDomain plugin and commands from here on in.
Update language files with `dzil msg-merge`.
Note changes for v0.931.
Attemp to fix "List form of pipe open not implemented" error on Windows.
Timestamp v0.931.
Increment to v0.932.
Add v0.932 to Changes.
One more try to fix Windows bug.
Timetamp v0.932.