Added Alfred App to installation
Updated iTerm2 installation to use variables
Added installation for asepsis
Added installation for Vagrant
Added installation script for Virtualbox
Updated dropbox.sh to use variables

More in line with the other installation scripts
Added installation script for HipChat
Merge branch 'master' of schmkr-github:schmkr/dotfiles

* 'master' of schmkr-github:schmkr/dotfiles:
  Removed session plugin, will re-add it as submodule
  Added gitgutter as a submodule
  Removing gitgutter and replacing it with a submodule