add QgsCoordinateReferenceSystem::authid() to python bindings

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@15408 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: jef

python/core/qgscoordinatereferencesystem.sip

@@ -216,6 +216,11 @@ class QgsCoordinateReferenceSystem
          * @deprecated use authid()
          */
         long epsg () const /Deprecated/;
+        /*! Get the authority identifier for this srs
+         * @return  QString the Authority identifier for this srs
+         * @note added in 1.7
+         */
+        QString authid() const;
         /*! Get the Description
          * @return  QString the Description A textual description of the srs.
          * @note A zero length string will be returned if the description is uninitialised