issue-28: added extension method to get side nav from any view controller
issue-28: added extension method to get side nav from any view controller

whitepixelstudios/Material,whitepixelstudios/Material,CosmicMind/MaterialKit,nanthi1990/MaterialKit,CosmicMind/MaterialKit,GraphKit/MaterialKit,CosmicMind/Material,TribeMedia/MaterialKit-1,GraphKit/MaterialKit,TribeMedia/MaterialKit-1,CosmicMind/Material,nanthi1990/MaterialKit,cohix/MaterialKit,cohix/MaterialKit