installing tornado along ipython to enable notebook
Merge branch 'master' of https://github.com/meduz/dotfiles

* 'master' of https://github.com/meduz/dotfiles:
  host is now changed easily in one line
  adapting to a low-end mac
 added an option for doing a backup just once a day
 Bottom left screen corner → Put display to sleep
Enter the name of your host

allowing to enter the name of the host
correcting updates

missing ;, reordering