Updated LICENSE

- Removed: old LICENSE file.
+ Added: new LICENSE.md file (MIT).
Updated README.md

* Updated: README.md - giving credit to Zach and his dotfiles.
Added setup scripts

+ Added: setup directory, containing install.sh, uninstall.sh and reinstall.sh
  Those are the main files used to install and uninstall my dotfiles.
Added ZSH configuration

+ Added: ZSH configuration (this is very basic ZSH stuff).
Small changes

* Changed: small changes in zsh configurations.