Use a name other than 'Distutils' for the python egg

`setup.py` currently calls setup with a name argument of 'Distutils'. That causes the installation to create a file named `Distutils-1.0-py2.7.egg-info` in the `site-packages` directory, possibly conflicting with the distutils package.

MobileDevice should choose its own unique name, such as 'MobileDevice'.
