Fix bugs

[modos189]

Library is not compiled because of a typo. Fixed, plus added extra check to prevent errors.

[johnd0e]

@Spaction
153525e introduced regression in event handling, open Issues section to discuss.

[johnd0e]

Also see IITC-CE#10

[johnd0e]

Leaflet.Canvas-Markers/src/plugin/leaflet.canvas-markers.js

Lines 135 to 139 in 153525e

	size = b.getSize(),
	m = L.Browser.retina ? 2 : 1;
	L.DomUtil.setPosition(container, b.min);
	},

size is already defined.
size and m assigned a value but never used.

---

Leaflet.Canvas-Markers/src/plugin/leaflet.canvas-markers.js

Line 562 in 153525e

var iconOptions = marker.options.icon.options;

iconOptions is assigned a value but never used.

---

Leaflet.Canvas-Markers/src/plugin/leaflet.canvas-markers.js

Line 281 in 153525e

var self = this;

self is not needed here as it is only used in the same scope (with the same this).

[johnd0e]

Leaflet.Canvas-Markers/src/plugin/leaflet.canvas-markers.js

Lines 494 to 501 in 153525e

	removeLayers: function (layers) {
	var self = this;
	layers.forEach(function (e) {
	self.removeMarker(e, false);
	});
	if (redraw && redraw === true)
	self.redraw();
	},

redraw is not defined.

[johnd0e]

Concerning last fix (ab64e18): in several places of code there are excessively verbose variant:

            if (self._map)
                isDisplaying = self._map.getBounds().contains(latlng);
            else
                isDisplaying = false;

Similar excessive patterns present in many places, e.g.

            if (redraw && redraw === true)

            if (isDisplaying === true && redraw === true) {

[johnd0e]

fix exception if image is not loaded (yet) / bad url / etc

I suppose there is one more fix needed: invalidate delayed draw queue (self._imageLookup[iconUrl][2]) on pan/zoom.
Small refactoring is needed to do it more effectively (separate queue from img cache).