namespacing, what a good idea

namespacing, what a good idea
helper method for error element in response
from_xml may be a better interface if i change how this works/is built
cleanup and add apipricefilter option
another step in the more eager-built direction
amazing and scary refactor to eager building plus adding a lot of response values we weren't using before
we have an accessor, no need for the @ here
give price filter back as range of floats
delegate a few more methods to the 'normal' ItemList
add a little example script