rework pickles in the tests

[ljwolf]

if we can, we need to avoid using pickles in the tests if this is going to be distributed by pysal.

Serialize the parameters we need.

[ljwolf]

Or, write a script we can run to regenerate the pickles as part of pysal.model.mgwr rather than gwr.

[TaylorOshan]

This is solved by #23? @ljwolf

[ljwolf]

yes, thanks for merging 😄 👍