Fixes geerlingguy#5: Add /etc/sudoers configuration for more Vagrant …

…convenience.

Added Docker to configuration.

Add MacVim to cask apps, and remove unavailable tap.

Run .osx dotfiles.

Split ansible-related config into separate task file.

Updates to work with updated version of geerlingguy.homebrew role.

Add vagrant-manager, and other casks that are nice to have installed.

Completely revamped the playbook. Let homebrew and cask do the hard w…

…ork.

Updated README again.