Remove useless trafic badge

GitHub now has native analytics
https://github.com/blog/1672-introducing-github-traffic-analytics
Add some QuickLook plugins for the Finder + allow text selection

Credits https://github.com/sindresorhus/quick-look-plugins
Fix git error "You need to run this command from the toplevel of the working tree."...

… when updating dotfiles themselves
Hide notice if there is no "Automatically Add to iTunes.localized"
COMPUTER_NAME is now based on $USER
Better solution to avoid tapped brew warning
Hide mysql link notice
removing dark menu bar for fullscreen (it's just ugly)
Add npm gulp
Add npm travis-encrypt
Comment the hide of the useless icons in menu bar (return an error)

https://github.com/mathiasbynens/dotfiles/issues/320