Added support for AIX 5.3 and 6.1

A collegue of mine has added basix AIX support to the setup, user and group modules.

We have tested this on AIX 5.3 and 6.1 and it works "as advertised"
Merge branch 'aix-fixes' of git://github.com/dagwieers/ansible into devel

Conflicts:
	library/setup

Tweak formatting.