Admin / Creator ability to delete events (#247)

Admin and creator ability to delete events. Delete option is hidden from non admin / creators.

https://github.com/18F/midas/issues/247
Two things:

1. Do you want to check if the person is an owner of the project here?  I would recommend you do.  You can look up using the `projUtils.authorized` method and the `projectId` from the event.
1. spacing is off at this line from the other lines