Start 1.2.0 cycle
Stop using --use-mirrors option for pip
Fix typo
Make doc2dash work on Python 3.3 too

This is due to the updatesof BS4 and lxml which didn't work together on 3.3 on
OS X before.
Avoid importing doc2dash inside of setup.py

@jezdez gets sad when we do that.
Add flake8 to tox
Some documentation polish
Build wheels
Nice travis integration