Update documentation (mostly appendix).
Correct minor regression problem.
Avoid to install behave4cmd0 together with behave.
Release behave-1.2.3a20
FIX: Include behave4cmd0 in sdist bundle.
BUMP-VERSION: 1.2.3 (was: 1.2.3a20) and release it.
Merge branch 'master' of https://github.com/behave/behave
BUMP-VERSION: 1.2.3 (was: 1.2.3a20)