Working from Ubuntu 14.04, but this should be generally applicable. When I installed, I called the following:
sudo python setup.py install
I noted the following statements describing the default installation:
...
Installing pildriver.py script to /usr/local/bin
Installing viewer.py script to /usr/local/bin
Installing gifmaker.py script to /usr/local/bin
Installing painter.py script to /usr/local/bin
Installing pilfont.py script to /usr/local/bin
Installing pilprint.py script to /usr/local/bin
Installing pilconvert.py script to /usr/local/bin
Installing enhancer.py script to /usr/local/bin
Installing pilfile.py script to /usr/local/bin
Installing createfontdatachunk.py script to /usr/local/bin
Installing explode.py script to /usr/local/bin
Installing thresholder.py script to /usr/local/bin
Installing player.py script to /usr/local/bin
Installed /usr/local/lib/python2.7/dist-packages/Pillow-3.4.2-py2.7-linux-x86_64.egg
So, I ran the following:
cd /usr/local/bin
sudo rm -f pildriver.py viewer.py gifmaker.py painter.py pilfont.py pilprint.py pilconvert.py enhancer.py pilfile.py createfontdatachunk.py explode.py thresholder.py player.py
sudo rm -f /usr/local/lib/python2.7/dist-packages/Pillow-3.4.2-py2.7-linux-x86_64.egg
After reinstalling Pillow (python-imaging) through apt-get, everything's running fine.