Use latest pillow in 1.4 tox tests
Use latest pillow in 1.4 tox tests

A change in the freetype libraries can make compilation of older pil
versions fail (for example, in Ubuntu 14.04)

SmileyChris/easy-thumbnails,sandow-digital/easy-thumbnails-cropman,Mactory/easy-thumbnails,sandow-digital/easy-thumbnails-cropman,siovene/easy-thumbnails,jaddison/easy-thumbnails