Merge pull request #64 from eile/master

Make travis config more verbose
Merge pull request #65 from eile/master

Refactor targets to be a bit more usable. Adapt README accordingly
Merge branch 'master' of https://github.com/Eyescale/Buildyard
Merge branch 'master' of https://github.com/eile/Buildyard
Merge branch 'master' of https://github.com/eile/Buildyard
nasm is a required dependency for jpegturbo