Prep for 0.0.5 release because 0.0.4 was busted

0.0.4 FAILed when running `py.test`:

```python
  File "/Users/marca/python/virtualenvs/httpie/lib/python2.7/site-packages/pkg_resources.py", line 2184, in load
    ['__name__'])
  File "/Users/marca/python/virtualenvs/httpie/lib/python2.7/site-packages/pytest_httpbin/__init__.py", line 3, in <module>
    with open("pytest_httpbin/version.py") as f:
IOError: [Errno 2] No such file or directory: 'pytest_httpbin/version.py'
```