Feature models

#11

Added location info to the event. Since every response is tied to an event, I figured the location information can be grabbed from there (I think its cleaner this way). Let me know if the location should also be added to the response.

I changed the way images are stored; its an `NSString`. This way, photos from the camera roll can be used and the URL can be stored, or just name or relative path if the image will saved in the application's home folder. It will also help with the memory footprint.

If this looks good, I'll generate the source code and start banging away at some logic tests.