Try to fix the tests on Travis.

I reckon Github needs a moment to catch up with the push.

t/Repo/prepare_for_push.t .................. 1/? Use of uninitialized value in string eq at /home/travis/build/evalEmpire/gitpan/blib/lib/Gitpan/Repo.pm line 222.
t/Repo/prepare_for_push.t .................. Dubious, test returned 25 (wstat 6400, 0x1900)
All 1 subtests passed
t/Repo/sync_with_github.t .................. 2/? Use of uninitialized value in string eq at /home/travis/build/evalEmpire/gitpan/blib/lib/Gitpan/Repo.pm line 222.
t/Repo/sync_with_github.t .................. Dubious, test returned 25 (wstat 6400, 0x1900)
All 3 subtests passed