ENH: Update SimpleITK 0.8.0 release

The manual download of distribute has been removed. The new
ez_setup.py file can fulfill the setuptools requirement.
SimpleITK's setup.py file can now utilize PowerShell, curl and wget to
download the required setuptools package of https.

From: Bradley Lowekamp <blowekamp@mail.nih.gov>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23024 3bd1e089-480b-0410-8dfb-8563597acbee