Install refactoring

About packages on CentOS: I mean it works well, because first two days when i tried to create all of this, i was stuck with not existing bucket problem. And had to set python into 'source' 2.7.7 from 2.6.6...
And my first decisions: standard library not working at all on CentOS. 
But after understanding this problem i see, that it's not library bug, it was my own stuck :))
About  `use_pip`: Yes, we can do this, but what if user don't have python cookbook at all? Add it into depends?