python-dbus: new formula v1.2.0

Closes #144
pillow: add CFLAGS for Xcode-only build

Fixes #141.
pillow: update dependencies Made libtiff, little-cms2, openjpeg and webp recommended for pillow.

Closes #116.
pillow 2.5.0
retext 4.1.3

Bundle dependencies instead of relying on system packages. Fixes #131.
pillow: find right little-cms
retext: depend on python3 pyqt
pillow 2.5.1