OK.  I switched it to drawImageKwargs to avoid confusing future coders who are more used to seeing `**kwargs`.  

The reason I didn't want to just use `**kwargs` in the first place is that these kwargs aren't really pertinent to this function (`ImageIntegrator.__call__`), so I thought it was cleaner to package them all up as a regular dict parameter.  For example, if we wanted to add options to this some day (currently there aren't any optional parameters for this function itself, but maybe we will want some eventually), it seemed like they should be kept separate from the ones to be passed onto `drawImage`.