rosie create: allow configurable owner per prefix
rosie create: add basic tests.

Test bad info file with --info-file=FILE.
Test empty answer in interactive mode.
Test with good --info-file=FILE.
Test normal mode with mock editor.
Test no checkout mode.
rosie create: document default owner setting.
Merge pull request #790 from matthewrmshin/rosie-create

rosie create: test battery