Merge branch 'python-bindings' of https://github.com/abiggerhammer/hammer into python-bindings

Conflicts:
	src/bindings/python/SConscript
	src/bindings/python/hammer_tests.py
	src/bindings/swig/hammer.i
	src/hammer.h
	src/parsers/choice.c
	src/parsers/sequence.c