It looks like this fix is no longer working, the Travis coverage build is showing warnings like:

```
No source for /tmp/astropy-test-R3kLXv/lib.linux-x86_64-2.7/astropy/config/__init__
No source for /tmp/astropy-test-R3kLXv/lib.linux-x86_64-2.7/astropy/config/affiliated
No source for /tmp/astropy-test-R3kLXv/lib.linux-x86_64-2.7/astropy/config/configuration
```

I'll see whether I can figure out why this is.