Allow Mapquest endpoint to be changed (similar to API key)#1

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chriscohoat wants to merge 3 commits intozachwill:masterfrom

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Commits on Mar 9, 2014

Added ability to set an API endpoint, in case open.mapquestapi.com should be used in place of mapquestapi.com.
chriscohoat
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Updated readme with endpoint information.
chriscohoat
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Fixed second python block in README.
chriscohoat
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