Allowing different formats

[xbony2]

This is part of #63, as it always returns XML regardless of whether JSON is set or not. See here.

[elifoster]

i suspect this will be a breaking change. not 100% sure how it'd be done nicely because the consumer really should not care how it's parsed.

[xbony2]

I think it just needs to be done mostly internally for #63, mostly just that it was annoying I couldn't use #query in making my own export function.