STYLE:  Do PEP8 compliance

To become pep8 compliant, the autopep8 tool
was used: http://pypi.python.org/pypi/autopep8/0.8.1

Since the code is really hard to read at the default
79 characters per line, I've optted to allow lines
upto 300 characters long.

for i in *.py; do
   autopep8 --max-line-length=300 -i $i;
done
ENH: Update ITKv4 to same as Slicer