Python 3 Windows test failure for find_api_page

On the Windows Jenkins instance, ``find_api_page`` is causing a failure:

https://jenkins.shiningpanda.com/astropy/job/astropy-winxp32-multiconfig/COMPILER=msvc,NUMPY_VER=numpy-1.5.1,PYTHON_VER=python-3.1/lastCompletedBuild/testReport/astropy.utils.tests/test_misc/test_api_lookup/

specifically:

```
>       for l in oistr.strip().split('\n'):
            ls = l.split()
E           TypeError: Type str doesn't support the buffer API
```

By the way, we should use ``iostr.splitlines()``, not ``split('\n')``, to make sure this works properly on Windows. Not sure if that's the source of the issue though.