0.6.7: write-policy can now be used easily as a library. Adjusted policy template names

• Template:
  • arn is now role_arn to avoid confusion when writing templates
  • tag is now tagging to avoid inconsistency when writing templates
• write_policy_with_actions write_policy_with_access_levels can be called directly.
• get_crud_template_dict and get_actions_template_dict are available so developers can create the templates by calling the library. They can pass that into write_policy_with_actions and write_policy_with_access_levels
• Added examples for the above in the docs