Adds marker and map recenter on user click event.
deletes old marker on creation of new click event marker, so there is only one guess location on the map at any time.
disables streetview pegman drop on guess map to prevent cheaters from prospering.
removes superfluous header.
adds streetViewPanorama to PlanetDarts index.
default streetview location set to Iceland
Merge pull request #6 from MDCox/dart_throwing

Dart throwing