Merge pull request #141 from bvssvni/master

Upgraded to latest Rust
Always read the background field.
Merge pull request #143 from nwin/master

Fix possible bug in gif.
Make color::Primitive trait public
Merge pull request #144 from tomaka/master

Make color::Primitive trait public
Added link to how to contribute

See PistonDevelopers/piston#715
Removed some spaces

Closes #140
Merge pull request #146 from leonkunert/master

Removed some spaces
Fix for change to enum namespaces
Merge pull request #148 from gchp/enum-namespace

Fix for change to enum namespaces
Update .travis.yml

Disable automatic tests for now. As long rust has so many breaking changes they are not very helpful.
Change occurances of rust-image to image
Merge pull request #149 from gchp/readme

Change occurances of rust-image to image
Fixed slice breaking changes

Closes https://github.com/PistonDevelopers/image/issues/150