Passing cloudformation template_parameters on the command line
like so was failing:

    ansible localhost -m cloudformation -a "...template_parameters=foo=5,bar=4..."

When cloudformation operation is successfully submitted but some step
during stack creation or update fails, operation result should be
failed=True.

When stack creation is rolled back, final status is not
CREATE_ROLLBACK_COMPLETE but ROLLBACK_COMPLETE.

Tags parameter requires at least version 2.6.0 of Boto module. When tags
parameter is used with older version, error is raised. When tags
parameter is unused, module works as before.

Expose boto.cloudformation.create_stack() tags parameter. Supplied tags
will be applied to stack and all it's resources on stack creation.
Cannot be updated later (not supported by UpdateStack CloudFormation
API).

The cloudformation module argument spec should match the documentation, so that template_parameters is a required argument.

No idea if I'm rebasing properly or not.  This is my first attempt.

Fixed bug in module_fail. Consistent error handling. Adding comments. Removal of unused variable. Removed unecessary wait_for option.  was never been used to begin with.  Trim down the stack_outputs.  Don't need to include stack name and region since they are already required parameters.  Rollback supported in status operations.  Using dict when possible.

  Migrated all examples: in DOCUMENTATION=''' string to standalone EXAMPLES=''' string
  Added deprecation warning to moduledev.rst and remove deprecated example from it
  Fixed up a few typos and uppercased some acronyms.
  add consistency to how EXAMPLES are formatted

Both modules seboolean and zfs have not been adapted since they defer from the default (either by having a 'null' or special state, or prefering "on"/"off" for state indication.