Added coordinates to locationType

Our original XSD had the ability to use GPS coordinates within the location element of a crisis. Lets say that a crisis' location is more ambiguous or a modern street address isn't available (I doubt the Holocaust would have a well defined street address, for example).

In this case, I kind of think coordinates allow the ability to specify an "area of effect." In fact, it might be helpful to allow multiple coordinates in a location, as if you wanted to specify multiple "locations" - but that may add too much complication.