Bump to 1.0.8

I've fixed default value for `--set` argument, because you can't .split() from None object. And it broke `bakery`. Another problem was with `requires` instead of `install_requires`. Probably now it can break your environments because now setup actually check for requirements. I've added instruction how to install on OS X, because it is not trivial. 

BTW, fresh install of all dependencies takes more than 2 hours to compile on my laptop :goberserk: