Update handling of recurse parameter to match Pinto > 0.093.

With 0.093, the command line parameter used to specify whether 'pinto
add' should recurse was changed to either '--recurse' or --no-recurse.

This commit updates the plugin and adds a set of tests that hijack
Dist::Zilla::Plugin::Pinto::Add::_run_pinto and confirm that it is
being specified correctly.
Merge pull request #13 from hartzell/master

Update handling of recurse parameter to match Pinto > 0.093.
Trying to fix submodule.

I don't know why git thinks this is a submodule.
There is no .gitmodules file anywhere.  So I'm
just going to delete it and then bring it back.
Bring back the DZT/Sample.pm file.
Update the change log.
Bump VERSION, regen README.
Wrap George's code in a proper subtest.
A little refactoring, to suit my style.
v0.088

    [BUG FIXES]

    - Fixed handling of the "recurse" option.  Code and tests were
    ontributed by @hartzell. Fixes GH #11