Strange error from Travis when running tests on node 0.10, so only use 0.8.

Travis output:

```
> ./node_modules/.bin/mocha --reporter dot --check-leaks test/*.test.js

․․․․․․․․․․node: ../deps/uv/src/unix/stream.c:483: uv__server_io: Assertion `events == 1' failed.

Aborted

npm ERR! Test failed. See above for more details.

npm ERR! not ok code 0

The command "npm test" exited with 1.

Done. Your build exited with 1.
```