Applying callback model to runner, and using that in playbooks, so output can be more immediate in playbooks.

(Runner still does not use callbacks for default output)

Show when options require arguments in the man pages.

This reverts commit bb0bf9ee.

Split conditional imports in playbook into subfunction, fix small bug in event reporting on playbook
actions.

buglet - make sure sshpass is included in runner for setup in playbooks

minor typo of AnsibleException/AnsibleError

User module

This relies on useradd, usermod, and userdel utilities on the system.
The argument name is required; if state is not provided, present is
assumed.  Other options supported for creating or modifying an existing
account:  uid, gid, comment, home, shell, and password.  If managing the
password, it must already be encrypted.  When creating an account, you
can also provide the argument createhome to control whether the home
directory is created.  Arguments supported for deleting an account are:
force (remove account even if user is logged in) and remove (remove home
directory).

Allow groups to be passed to runner API to make parse_hosts optional, misc fixes as a result of refactoring in Runner.
Cleanup in Playbooks module is next.

misc cleanup in the runner module, splitting some things out into utils, breaking up functions into smaller functions.

Allow variable expressions to be stored as variables themselves, do some things to allow setup strings
to more easily contain spaces without being mangled, which is neccessary because of the above.

playbooks -- Ratchet up logging prior to gating things with verbosity controls and upgrading output format