markerInCenter is broken. Causes looping google maps head requests.

[mattnwa]

example from readme You can see the map refreshing in the center map example.

[TrieBr]

It must be something on googles end because my code was working a couple weeks ago and suddenly within the last few weeks it broke. You'll also notice you can't type an address because its continually refreshing and overwriting the address.

I created a pull request to fix this #133