Start of more OSX facts for setup

Added a Darwin family, commit acc1c004 had added some network facts
but weren't being shown as the Darwin family wasn't in use. This commit
reveals these facts.

A Darwin(Hardware) class has also been created ready to be populated with
hardware facts.
Teach makefile to accept different versions of python

This commit makes the Makefile nicer for packagers so they can select versions
of python. E.g. on a RHEL5 system with Python2.6 (installed from EPEL)

	make PYTHON=python2.6 install
Add openbsd_pkg: package management for OpenBSD.

* Code influenced by the service module but without classes.
* Thanks to @dhozac for input and review.
* Thanks to @johanwiren for getting me to push this out the door.
Teach setup about OpenBSD package manager.

* We cannot depend on the path because FreeBSD for example uses the same path.
Add socket timeout to uri module.

The uri module can be configured to abort after a specified timeout if
it cannot connect to the configured uri. This prevents a uri action from
hanging indefinitely when the remote endpoint cannot be reached because
it is unavailable, there is a firewall in place etc. The default behavior
is left unchanged: timeout=None

This change also introduces a new type for module_parameters: int
Code was added to perform conversion from string -> int type in
module_common.py.

The new type was required in order to play nice with httplib2 which
refuses to accept (and convert) anything other than a numeric type for
the timeout value.
allow use of backrefs in lineinfile
avoid the instance start--state-fetch race
waiting enhancements
fix documentation
fixed case and punctuation
Merge pull request #2278 from jcftang/devel

Teach makefile to accept different versions of python
Merge pull request #2283 from eest/openbsd_pkg

Add openbsd_pkg: package management for OpenBSD.
Merge pull request #2334 from pieska/upstream

allow use of backrefs in lineinfile
Merge pull request #2274 from jcftang/setup-osx-facts

Start of more OSX facts for setup
Merge pull request #2337 from dparalen/wait_fix

EC2 Wait fix
Merge pull request #2286 from gavares/url_timeout

Add socket timeout to uri module.
Merge branch 'devel' of https://github.com/ansible/ansible into devel
Added OpenBSD facts