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Adding structured search options to Nominatim::Search.
As described in http://wiki.openstreetmap.org/wiki/Nominatim#Parameters, you can send structured search requests using street, city, county, state and country parameters.
This commit adds these methods to the Nominatim::Search. Since you cannot mixed structured requests
with the q parameter, if an structured search is performed, the q criterion is deleted before
performing the request.