Ansible 2 系を brew コマンドを使ってサクッと Mac にインストールしました。

$ brew info ansible
ansible: stable 2.0.2.0 (bottled), devel 2.0.2.0-0.4.rc4, HEAD
Automate deployment, configuration, and upgrading
https://www.ansible.com/
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/ansible.rb
==> Dependencies
Build: pkg-config ✘
Required: libyaml ✘, openssl ✘
==> Caveats
Homebrew writes wrapper scripts that set PYTHONPATH in ansible's
execution environment, which is inherited by Python scripts invoked
by ansible. If this causes problems, you can modify your playbooks
to invoke python with -E, which causes python to ignore PYTHONPATH.

$ brew install ansible

$ ansible --version

ansible 2.0.2.0
  config file = 
  configured module search path = Default w/o overrides

以上です。