provide default for parent in I.haveFolder helper
The API should just be simplified a little:
await I.haveFolder({ title: 'foo', module: 'infostore' });
// should be the same as
const parent = await I.grabDefaultFolder('infostore');
await I.haveFolder({ title: 'foo', module: 'infostore', parent });
Something similar for I.haveFile