Merge pull request #32 from greenTara/master

separating out modules for <content> and stripe-skipping
implementing modules for ordered and unordered groups (positional independence)

Signed-off-by: greenTara <taraathan@gmail.com>
redefining content models of Deliberation RuleML, as in issue #34
verifying the RNC schemas using instance generation issue #23

Signed-off-by: greenTara <taraathan@gmail.com>
fixing inadvertent drop of Quantifier from Reify and content (through Node.choice)

Signed-off-by: greenTara <taraathan@gmail.com>
updating content models, as in issue #16

Signed-off-by: greenTara <taraathan@gmail.com>