[ansible] Add role for OS X

ansible/hosts

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+[local]
+localhost

ansible/main.yml

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+- hosts: local
+  connection: local
+  roles:
+    - osx
+    - dotfiles

ansible/roles/dotfiles/tasks/main.yml

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+---

ansible/roles/osx/tasks/casks.yml

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+---
+# - homebrew: name=caskroom/cask/brew-cask state=upgraded
+- command: brew install caskroom/cask/brew-cask
+- homebrew_cask: name={{ item }}
+  with_items: casks

ansible/roles/osx/tasks/fonts.yml

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+---
+- homebrew_tap: tap=caskroom/fonts
+- homebrew_cask: name={{ item }}
+  with_items: fonts

ansible/roles/osx/tasks/homebrew.yml

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+---
+- homebrew: name={{ item }} state=upgraded
+  with_items: formulae
+- homebrew: name=macvim install_options=override-system-vim state=upgraded
+- command: brew linkapps

ansible/roles/osx/tasks/main.yml

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+---
+- homebrew: update_homebrew=yes
+- include: homebrew.yml
+- include: casks.yml
+- include: fonts.yml

ansible/roles/osx/vars/main.yml

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+---
+formulae:
+  - chruby
+  - ctags
+  - fasd
+  - git
+  # - macvim # Needs install_options=override-system-vim
+  - ruby-install
+  - reattach-to-user-namespace
+  - the_silver_searcher
+  - tmux
+  - youtube-dl
+casks:
+  - adium
+  - dropbox
+  - google-chrome
+  - firefox
+  - moom
+  - plug
+  - qlmarkdown
+  - qlstephen
+  - quicklook-csv
+  - quicklook-json
+  - steam
+  - things
+  - ynab
+fonts:
+  - font-sauce-code-powerline