triceam/Leaflet.Zoomify — pull request #1 by kurtbeheydt (2014-08-29 14:11:37+00:00)
Title: rewrite of onAdd method

Added feature so you can add a zoom level and center position to override the defaults of the onAdd method.

e.g.
```
var m = {
x: 1000,
y: 1000
};

L.tileLayer.zoomify('/tiles-folder/', {
width: 2560,
height: 2560,
maxZoom: 4,
minZoom: 2,
zoom: 4,
center: map.unproject([m.x, m.y])
}).addTo(map);
```