Start better support for 16 bit images.
Merge branch 'master' of https://github.com/nwin/rust-image
fix tests
Get rid of unsafe unsafe in TIFF decoder.
Merge commit 'd3dce7a88d6dc1101604e5f227f49ddbe5eb6ea2'
Merge pull request #210 from nwin/master

Better infrastructure support for 16 bit images