Remove pngout.
authorGuo Xiang Tan <tgx_world@hotmail.com>
Fri, 19 Feb 2016 08:15:17 +0000 (16:15 +0800)
committerGuo Xiang Tan <tgx_world@hotmail.com>
Fri, 19 Feb 2016 08:15:17 +0000 (16:15 +0800)
commitc5d84eadf43425617f2215d808cef8ab45a22373
treed11da30e0dc423ac8fa26160361123f97ce53a42
parenta1bc8635c3c171e56d04271419a3943ccb04fe01
Remove pngout.

fixes https://github.com/discourse/discourse_docker/issues/207
image/base/Dockerfile