update model download URL

Merge branch 'master' of github.com:satoshiiizuka/siggraph2016_colorization

Added ImageNet model.

Reset characters color after the last message

Output should always be exact same size as input.

Do not specify shell interpreter for the script.

Recommend system with >= 4 GiB RAM.

Download script checks md5sum now.

Added checksums.

Readme - performance tips.

Clarified installation.

Let wget try to continue the download

Fix syntax error in download_model.sh

Readme tweaks.

Example image.