Be able to use arbitrary API methods #16
Description
Since Amazon::MWS might never support the whole list of possible Amazon API methods, it would be very useful to be able to send an arbitrary request without requiring all its details to be pre-specified by define_api_method.
I imagine a "call_api_method" which is similar to the method generated by "define_api_method", but the "parameters" hash would not be used. Instead, we could specify arbitrary values to be included in %form and $body.
I will probably need to build something like this for myself, and then I can offer a patch. Do you have any feedback about how it should be done?