Missing wheel files

Hello,

since version 0.1.2, no wheel file has been uploaded to pypi.org.
(cf https://pypi.org/simple/django-npm/)

This could improve the installation speed.

```
git checkout v1.0.0
pip install -U setuptools wheel
python setup.py bdist_wheel
```
followed by some testing before uploading to PyPI would do the trick :)