0.9 doesn't seem to be available in the Travis CI builds?

Looking at the log [here](https://travis-ci.org/Aaron1011/BrowserQuest/jobs/9113473), it seems to show it ***trying*** to use 0.9, but failing with that and instead defaulting to 0.10:

```
$ nvm use 0.9
N/A version is not installed
v0.10.12  v0.11.3  v0.6.21  v0.8.23  v0.8.25
stable: 	N/A
latest: 	N/A
current: 	v0.10.12
0.1 -> v0.10.12
0.10 -> v0.10.12
0.11 -> v0.11.3
0.6 -> v0.6.21
0.8 -> v0.8.25
default -> v0.10.12
$ node --version
v0.10.12
```