Updated to accept a minOpacity

Built the dist

Added build commands to README

@mourner suggestions updated

Squashing commits

Squashing again

README.md

@@ -24,13 +24,17 @@ To include the plugin, just use `leaflet-heat.js` from the `dist` folder:
 <script src="leaflet-heat.js"></script>
 ```
 
+## Building
+To build the dist files run:
+```npm install && npm run prepublish```
+
 
 ## Reference
 
 #### L.heatLayer(latlngs, options)
 
 Constructs a heatmap layer given an array of `LatLng` points and an object with the following options:
-
+- **minOpacity** - the minimum opacity the heat will start at
 - **maxZoom** - zoom level where the points reach maximum intensity (as intensity scales with zoom),
   equals `maxZoom` of the map by default
 - **max** - maximum point intensity, `1.0` by default

src/HeatLayer.js

@@ -7,6 +7,7 @@
 L.HeatLayer = (L.Layer ? L.Layer : L.Class).extend({
 
     // options: {
+    //     minOpacity: 0.05,
     //     maxZoom: 18,
     //     radius: 25,
     //     blur: 15,
@@ -174,7 +175,7 @@ L.HeatLayer = (L.Layer ? L.Layer : L.Class).extend({
         // console.timeEnd('process');
 
         // console.time('draw ' + data.length);
-        this._heat.data(data).draw();
+        this._heat.data(data).draw(this.options.minOpacity);
         // console.timeEnd('draw ' + data.length);
 
         this._frame = null;