Python-omgeo

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* Fix bug using wrong key for MapQuest postalCode

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* Fix bug using wrong keys for ESRI
findAddressCandidates endpoint in EsriWGS class

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* Fix bug in AttrMigrator.__repr__()

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* Fix ordering of default postprocessors for EsriWGS geocoder
* Improve handling of ZIP+4-only searching using EsriWGS
* Add repr() method to UpstreamResponseInfo class
* Minor documentation updates

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* Add support for ESRI World Geocoder service
* Add documentation built in Sphinx
(available at python-omgeo.readthedocs.org)
* Add shell script to rebuild, set API keys, and run tests
* Move pre- and post-processor modules to package base
* Add validation on Viewbox initialization
* Add repr() methods for place objects, including graphical
Viewbox representation
* Modify ReplaceRangeWithNumber preprocessor to be friendly
to ZIP+4 postal codes.

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* Add original PlaceQuery to nested dict method response