Add ability to create SSH key for user in user module

add role_attr_flags parameter to postgresql_user

Vars specified via CLI have the highest priority.

This allows one to create a SSH key for user.  You may define:
ssh_key_type, ssh_key_bits, ssh_key_file, ssh_key_comment,
and ssh_key_passphrase.  If no passphrase is provided, the
key will be passphrase-less.  This will not overwrite an existing key.
In the JSON returned, it will provide the ssh_fingerprint and
ssh_key_file.

make policy only be required if state is not disabled

Update Hadoop contrib URL.

when a pkg is installed, but not from any repo, don't error out

that it is not installed.

Also when a pkg is both installed and in a repo do not look it up
more than once

References issue #1380.

Raise error for missing hosts in inventory scripts as well

None is unfortunately not an integer

Copy module can replace symlink with a real file.

Add support for Github-flavored Markdown to module_formatter

module_formatter: .rst now correctly handles code examples

Addition to WhoUses + typo fix

symlink fix

docsite: small typo in handlers example yaml

Fixes for ansible_ssh_host and ansible_ssh_port

 - fixed template (it was the template), adding indentation with Jinja2
 - added description of code examples to man-page template (was missing)
 - fixed fireball, cron, and debug module examples to confrom

- Uses HTML tables and Github-flavored code blocks (3 backticks)