Marker cluster images URLs updated

[davidpelayo]

Fixes #54 and #59, at least what urls are used on this repo.

This doesn't fix those apps with the SVN based codebase which still point to the old repo, due resources aren't available (they have removed them out).

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[davidpelayo]

Related to #56, #57 and #60.

[davidpelayo]

@WACMemphis I've updated the url to:

MarkerClusterer.prototype.MARKER_CLUSTER_IMAGE_PATH_ =
    'https://googlemaps.github.io/js-marker-clusterer/' +
    'images/m';

[googlebot]

CLAs look good, thanks!

[AlaorSilva]

The only URL that works for me on markerclusterer_compiled.js and markerclusterer.js is
https://raw.githubusercontent.com/googlemaps/js-marker-clusterer/gh-pages/images/m

Neither CDN or https://googlemaps.github.io/js-marker-clusterer/ works for me.

When I put one of above the map goes to somewhere else, and I have no markers

[ghost]

@AlaorSilva
Works perfectly fine with CDN here. Make sure all of them end with "images/m"

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[PeterTheOne]

fixed by 2f659a3