Generate warnings when users are shelling out to commands
rather than using modules
Can be turned off on a per-action line with the documented
warn=False flag. Can be turned off globally using
command_warnings = False in ansible config file.
Print out warnings using the standard playbook callbacks.
Created some additional tests in TestRunner.test_command
and also a demonstration playbook.
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
