Revert "Add submodule 'atom'"

This reverts commit 7e855d6d0ce2a0dc8cf795f52070de6f095aff5f.
Install qlimagesize with brew-cask.
NPM: Remove unused packages.
OSX: Disable Notification Center
Add shipit script
Add manpdf function.
Update url to install.
Update brew.sh. Remove casperjs.
Add Zsh plugins.
Update cask.sh.
Sublime: Update settings.
Add alias 'push-for-review' code review for gerrit.
Zsh: Update password function.
Update zshrc
Fix import iterm2 theme.