Allow override of default zoom

[elliotlewis]

In the situation of having 1 (or more markers) and fitBounds = false. Being option to override the default zoom level of 10.
*If Google Maps isn't using fitBounds, map requires center-point and zoom: ttps://developers.google.com/maps/documentation/javascript/tutorial#MapOptions

[objectivehtml]

This code is somewhat redundant. You can see on line 94 of that file you edited that the default options object is merged with a new object, and the options that are passed in the template. So what you are doing there is effectively doing the same thing as below, except its arbitrary to a specific option key. Make sense? Why can't you just override the zoom in the template and set fitBounds to false?

[elliotlewis]

@objectivehtml Ah, line 94 is where the bug is. I can see that the underscore.js extend function combines objects, but you're defining this.options by combining defaultMapOptions and the as yet undefined this.options.

It should be combining with the passed-in options or defined options={}

ie.

this.options = _.extend({}, defaultMapOptions, options);

not

this.options = _.extend({}, defaultMapOptions, this.options);

If you're not defining the defaultMapOptions zoom with the passed-in options.zoom then it seems redundant to define center with options.lat and options.lng

I guess the options argument would have to have a center property with lat/lng object but at least that follows Google Maps API docs. eg.

options = {
 center: { 10, 20 },
 zoom: 16
}

*NB I can't see how to squash these commits together in GitHub but I think you can during the merge.