Update timestamps when changing layer status.
Update timestamps when changing layer status.

kdeloach/raster-foundry,kdeloach/raster-foundry,azavea/raster-foundry,raster-foundry/raster-foundry,aaronxsu/raster-foundry,raster-foundry/raster-foundry,raster-foundry/raster-foundry,azavea/raster-foundry,kdeloach/raster-foundry,aaronxsu/raster-foundry,aaronxsu/raster-foundry,kdeloach/raster-foundry,aaronxsu/raster-foundry,kdeloach/raster-foundry,azavea/raster-foundry,azavea/raster-foundry,azavea/raster-foundry