added michelebologna theme
added comment for auto-generated hostname color
Merge pull request #1645 from mbologna/master

a new theme, different from the already existent themes :)
Merge branch 'master' of https://github.com/robbyrussell/oh-my-zsh
Merge branch 'master' into local
Merge branch 'local' of github.com:diogro/oh-my-zsh into local