New Maps-Engine sample.
Reviewed in https://codereview.appspot.com/36120043/.
Index: samples/maps_engine/README
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+This sample code demonstrates use of Google Maps Engine. These samples do not
+make use of the Discovery Service, but do use the the httplib2 library to make
+authenticated requests. For more information on Google Maps Engine, see
+developers.google.com/maps-engine/documentation/
+
+api: mapsengine
+keywords: maps engine mapsengine
+author: Josh Livni