More types in one Events API call (BB-6138)

Currently, the type of events you wish to load using the API is specified using the type parameter, for example, "?type=commit". Now, if I wanted to get all other events but not commits, I'd currently have to make about thirty calls to the API, as it appears you cannot negate the call ("?type=!commit") or specify many types at once ("?type=fork&type=issue_update"). So, please add the possibility to negate the type and to specify multiple types at once.