Merge pull request #220 from Transkribus/master

0.3.1 RC2

fixed typo in docs: unary potential shape

bump version once more for minor python3 test fixes.

bump version for 2.4 release.

use distutils and setuptools to work on os X.

remove pyqpbo from setup.py

remove pyqpbo dependency for easier build.

make lp default inference in plot_svm_objectives

REL bump version to 0.1.1

FIX add init files for test modules.