Add orderby

I added functions for using the optional orderBy and ascending parameters with [DataService.query](http://help.infusionsoft.com/api-docs/dataservice#query).

I'm not that familiar with this implementation, so there may be a better way to add this functionality, but this was getting the job done for me.

I "have not tested every bit, of every call, in every direction, for every scenario" either :)