Fix comments and ruby < 2.0 compatibility
Fix comments and ruby < 2.0 compatibility

toy/image_optim,mihailim/image_optim,ramiroaraujo/image_optim,weheartit/image_optim,weheartit/image_optim,mihailim/image_optim,toy/image_optim,ramiroaraujo/image_optim,weheartit/image_optim,toy/image_optim,mihailim/image_optim,ramiroaraujo/image_optim