fix black top-left border after resize (issue #197)
fix black top-left border after resize (issue #197)

nwin/rust-image,PistonDevelopers/image,PistonDevelopers/image,bvssvni/image,lady-segfault/image,huonw/image,ruud-v-a/image,hetzge/image,JaySon-Huang/image,TyOverby/rust-image,twoodford/image,mbrubeck/image,dtwood/piston-image,theotherphil/image,tomaka/image