Add an options argument to query

[leops]

The pull request adds a news argument to query, so you can specify options instead of the default primary=true. Options are formatted as an object, like this : {option: value, option: value}.
This new argument is optional, if not defined it will default to {primary: true}.

[strax]

Thanks!
Two things: the options should be URL-encoded, and the changes need to be tested. Could you add unit tests for the functionality?

[toymachiner62]

👍 Will this allow you to specify the output format that I want such as MathML for example?

[strax]

@toymachiner62 If the output format can be specified via the query params then, in theory, yes. Outputting in a format other than XML would break response parsing, however.