feat(): Update required Node up `0.10`

Updates the TravisCI configuration to use Node 0.10.*

Actually, Travis uses already 0.10 because it cannot find `0.8.1` (anymore).

For example: https://travis-ci.org/PascalPrecht/angular-translate/builds/12530681

```
$ nvm use 0.8.1
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
```