Improves syntax highlight of ansible keywords in playbooks.

[LucianoCavalheiro]

Add font-lock keyword definitions to task names, variable expansions, first level sections, etc. Most faces used are standard, except by two, which are configured via customization variables.

The use case I see it to hook ansible mode to yaml-mode in .emacs, so that playbooks will have better syntax highlight:

(defun ansible-playbook-hook()
  (yas-minor-mode 1)
  (auto-complete-mode 1)
  (autopair-mode 1)
  (linum-mode 1)
  (ansible 1)
  (local-set-key (kbd "C-m")   'newline-and-indent)
  (local-set-key (kbd "C-c d") 'ansible-doc)
)
(add-hook 'yaml-mode  'ansible-playbook-hook)

[k1LoW]

@LucianoCavalheiro Thank you! Nice work!!