Add user and host from a function; new colors for failed/passed/dirty, and use different colors if being root or not (as a sysadmin as often use `sudo -s` and need my prompt to make it clear).
Add a screenshot and update the README.
README img path fix
Major changes in `README`: new functionnalities, success report on different applications, links updates.
Merge branch 'release/1.1' to resync `develop` and `master` branches.
Merge tag '1.1' into develop

powerline-shell-1.1