Added ability to get multiple points from /nearest by using num_results argument

Include/osrm/RouteParameters.h

@@ -40,6 +40,8 @@ struct RouteParameters
     RouteParameters();
 
     void setZoomLevel(const short level);
+    
+    void setNumberOfResults(const short number);
 
     void setAlternateRouteFlag(const bool flag);
 
@@ -72,6 +74,7 @@ struct RouteParameters
     bool compression;
     bool deprecatedAPI;
     unsigned check_sum;
+    short num_results;
     std::string service;
     std::string output_format;
     std::string jsonp_parameter;