typo
Update README.doc to fix spelling error
provide basic memory information for Mac OS X
fix in case the unit is not uppercase (kB for kilobytes is an example)
suse platform: read /etc/SuSE-release only once.

doing it twice is (slightly) inefficient and complicates the tests
[OHAI-339] distinguish openSUSE from SUSE Linux Enterprise

- platform_family: stays "suse" for both
- platform: SLE, being the more stable platform,
                 gets to keep platform "suse"
            openSUSE is now platform "opensuse"
- platform_version: is "MAJOR.MINOR" even for SLE which officially is
                    versioned as "MAJOR [SP MINOR]"

I considered to change the platform only for *future* openSUSE
versions (12.3 or later) but decided against it: "suse" >= 12 would
then conflict with a future SLE 12 (scheduled for 2014).
Merge branch 'master' of git://github.com/opscode/ohai into OHAI-431
use sysctl and vm_stat to get up-to-date mem stats. also lump in wired memory with active memory.
include test. use from helper.
[OHAI-458] Include Joyent SmartOS specific attributes in Ohai
change license mit to apache2
Merge branch 'master' of git://github.com/opscode/ohai into OHAI-431
Disable root_group on Windows

Fixes OHAI-490: http://tickets.opscode.com/browse/OHAI-490

Implementation of root_group for windows has been found to have poor
performance when the host is joined to an AD domain. Opting to disable
on Windows since large changes will be required for a performant
implementation.

Cherry-picked from master for 6-stable.

Conflicts:
	spec/unit/plugins/root_group_spec.rb
Merge branch 'OHAI-490-6-stable' into 6-stable
Bump version for RC4
Version update to 6.18.0 GA
New plugin map for Ohai::System controller. Added and updated spec tests to reflect changes.
extend plugin dsl for ohai 7. separate plugin loading.
convert plugins to new dsl.
updated and added spec tests for new dsl