Always sort array parameters/properties

Do this by overriding the `insync?` method and sort both the "is" value
(coming from Opsview) and the "should" value (coming from the Puppet
manifest). This obsoletes the requirement that the user supply array
parameters pre-sorted alphabetically. Should fix issue #8.
Merge pull request #19 from antaflos/sort_array_params

Always sort array parameters/properties