Adds challenge06 syllabus resource

Taken from https://gist.github.com/tqbf/3132752, it's
needed to run challenge 06
Adds .travis.yml, to enable travis builds
Merge pull request #2 from nberger/add-travis-yml

Adds .travis.yml, to enable travis builds
Merge pull request #3 from nberger/add-challenge06-syllabus

Add challenge06 syllabus