Bump zc.buildout and more - rerun bootstrap!

Upgrade
* zc.buildout: 1.6.1 -> 1.7.0
* distribute: 0.6.32 -> 0.6.34
* mr.developer: 1.23 -> 1.24
* collective.recipe.supervisor: 0.18 -> 0.19

Please rerun bootstrap, i.e. if you're using the development version:

    bin/python bootstrap.py -c buildout_development.cfg
Upgrade lxml (3.0.1 -> 3.0.2)
Upgrade psycopg2 (2.4.5 -> 2.4.6)
Upgrade SQLAlchemy (0.7.9 -> 0.7.10)