Shapefile reader should accept files with or without '.shp' extension

[artemp]

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[artem] Hmm.. I'm not completely sure about this one. Perhaps, we should be handling both cases (with and without ext). Pushing to 0.7.0

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[springmeyer] Ya, it surely should handle both cases. Sorry not to make that clear.

I figure that a user should be able to put either file='world_borders' or file='world_borders.shp'

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[springmeyer] The attached patch offers the behavior I was envisioning. It would likely be more robust by using 'boost::filesystem::basename(shp_path)' rather than string replacement, but the above approach was quickest to code up.

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[springmeyer] revised patch applied in r1046