Update git flow

This work flow is broken or at least not complete, since if we would like to fix critical bug on production (`master`) we have to branch from `master` and apply that both to `master` and `stable`. If we will do it like it is suggested above, by branching from `next` then we will not be able to apply that fix into master without including already existing changes (which could be incomplete or planed on next release) from `next`.

I will try to suggest a new PR base on the work flow from [here](http://nvie.com/posts/a-successful-git-branching-model/)