the scipy install is taking a lot of build time, maybe better to install via dpkg, like bamboo does, https://github.com/pld/bamboo/blob/master/.travis.yml,
```
before_install:
  - sudo apt-get install -qq gfortran libatlas-base-dev python-numpy python-scipy
```
and then pin the scipy version to ubuntu's latest, `scipy==0.9.0`, probably worthwhile to pin scipy either way since it's such a large package.