small updates

  * I've made sure the identifier for combined "transient" tags includes all the tags that make it up. If quicksilver/Quicksilver#1363 or something like it gets accepted, this will allow people to use these combined tags in triggers, etc.
  * I've changed the details for combined tags to use `+`
  * I've added support for Event Triggers. I'm going to be doing that to tons of plug-ins because the potential is huge.

If you're too busy to deal with pull requests, we can move this repo to the Quicksilver organization. Let me know.