Use 'context' instead of 'canvas' to work with latest Compose.
Merge branch 'master' of https://github.com/dcjones/Mamba.jl into dcjones-master
Merge branch 'dcjones-master' into develop
Add link to contributors.
Require Compose 0.3.1 and Gadfly 0.3.
Update to version 0.0.3.