issue-24: added convenience for left bottom
issue-24: added convenience for left bottom

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