add some tests to match changes made in new ruby model
tag omission rules for rb|rt|rtc|rp followed by rb|rt|rtc|rp|span
tag omission rules to test rt when ruby is nested and outer ruby has rtc
Add a case to check rt auto-closes rb/rt/rp butnot rtc
Merge pull request #1 from kojiishi/new-ruby-additions

Additional test cases for new ruby model
Merge pull request #27 from darobin/new-ruby

Add some tests to match changes made in new ruby model