Update install/osxdefaults scripts to fix bugs

- Silence output of xcode-select & update printing function to be
  smarter
- Setup Homebrew cask app symlinks to ~/Applications as suggested by the
  output of the MacVim brew installation
- In order to get Alfred & Dropbox to startup on login, open apps and
  close immediately, although in Alfred you have to accept the first
  prompt, so it closes the app when all osxdefaults apps are restarted
- Update the name of iTerm2 to be correct as iTerm
- Change unknown argument in osxdefaults under Address Book section to
  correct argument
- Add iTerm2 & Alfred 2 to be apart of the apps that are killed

Issue: #22