Turning off animation when setting center coordinate and using regionThatFits when necessary

  * The animation was turned off on centering on a coordinate because
    it was consistently changing zoom levels when used right after
    resizing the frame of the map view.  Turning it off appeared to
    remove the side effects.

    I believe it was due to the transient nature of the window sizing
    that was causing centering to change its latitude and longitude
    deltas on region calculation (hidden in native apple libs).