Integration tests are flakey on CI

[withoutboats]

cargonauts has some integration tests that run the examples in the examples directory and make requests of them, to make sure the whole system is working at least kind of correctly.

These have proven to be pretty flakey on CI, failing requests with ConnectionRefused a litle too often. I don't know why this is but would be great for this to get fixed somehow. Ideas:

1. Figure out why this happens on CI (doesnt happen on my machine) and maybe there's a config on travis that could be changed to fix it.
2. Maybe there's a small change to the tests that could fix the problem.
3. If not, figure out another way to get the same end-to-end testing without actually performing a TCP connection.