Use numeric group ID to allow portability to *BSD.
add clientnoop to the list of dynamic facts that are filtered out

So running puppet --noop doesn't show differences in the facts.yaml file
Merge pull request #134 from maestrodev/ignore-clientnoop

add clientnoop to the list of dynamic facts that are filtered out
Merge pull request #110 from jasperla/issue/101

Use numeric group ID to allow portability to *BSD.
Allow listing facts to exclude from facts.yaml

Add a new parameter `$mcollective::excluded_facts`, defaulting to `[]`.
The facts specified therein are added to the default list of facts to
exclude from the generated facts.yaml.

Contains updated documentation and spec tests. Fixes MODULES-548.