invoking rule with argument
modified per hab's comment
update setNext
syntax modification
Merge remote-tracking branch 'upstream/master' into rule_argument
Merge pull request #37 from introom/rule_argument

invoking rule with argument
ISO 8601 parser for the examples
Make hash of equivalent terms the same
Merge pull request #43 from jml/hash

Make hash of equivalent terms the same
Skip iso8601 example tests if there's no pytz.
Add pytz to travis deps for example testing.
Merge branch 'iso8601'
Merge pull request #1 from python-parsley/master

Merging back all the new stuff