Add support for the triggers API.
Add support for the Opens API.
Adjust for a change in the triggers API.
Fix a broken test on mail 2.6.0.
Use a Ruby 1.8.7-compatible mime-types gem for testing.
Add support for TrackOpens flag via Mail::Message and simple API.
Get rid of shared extensions since we don't support TMail anymore.
Bump VERSION number, update CHANGELOG.
Fix unexpected nested namespace lookup.
Use Postmark global JSON parser in tests to avoid ambiguity.
Update README with open tracking info.