Clean up event types -- Part 1

Part 1 changes all old event types into the new event types
Part 2 (#656) will make sure new events that are added will have the new event types and will update all the unit tests

In the example below, all events with type "District Event" gets changed to type "District" (since those were the only ones improperly named on my local dev).
![eventtype-1](https://f.cloud.github.com/assets/1421884/693627/a39ba444-dc94-11e2-8238-9178b3b34fe7.png)

The right two columns show "Old Event Type" and "New Event Type"
![eventtype-2](https://f.cloud.github.com/assets/1421884/693628/a39a135e-dc94-11e2-8d7e-00388e2e6511.png)

Updated events
![eventtype-3](https://f.cloud.github.com/assets/1421884/693629/a39cb532-dc94-11e2-8d6b-b1a1f0f47be4.png)