Expose setStyle and delStyle methods
Expose setStyle and delStyle methods

This is meant to be used by subclasses to do deletion and reset
of associated styles (particularly for setting the public style
from an authenticated request, see
https://github.com/Vizzuality/Windshaft-cartodb/issues/41)

manueltimita/Windshaft,wsw0108/Windshaft,CartoDB/Windshaft,CartoDB/Windshaft,manueltimita/Windshaft,wsw0108/Windshaft,CartoDB/Windshaft,manueltimita/Windshaft,HydroLogic/Windshaft,wsw0108/Windshaft,HydroLogic/Windshaft,HydroLogic/Windshaft