Add extra cheapseats entries to the travis build matrix

### http://www.theonion.com/articles/fuck-everything-were-doing-five-blades,11056/
![](http://3.bp.blogspot.com/_M709Q6IN1Ko/TIk6dwCkNrI/AAAAAAAAAA4/NDD9mlxowsY/s1600/blade+progression.jpg)

- Push travis's build matrix (http://docs.travis-ci.com/user/speeding-up-the-build/) to run 5 jobs concurrently