Merge branch 'master' into 848-remove-unsafe-lifecycle-methods

Author: alex3165

.npmignore

@@ -0,0 +1 @@
+

README.md

@@ -50,11 +50,13 @@ Example:
 ```jsx
 // ES6
 import ReactMapboxGl, { Layer, Feature } from 'react-mapbox-gl';
+import 'mapbox-gl/dist/mapbox-gl.css';
 
 // ES5
 var ReactMapboxGl = require('react-mapbox-gl');
 var Layer = ReactMapboxGl.Layer;
 var Feature = ReactMapboxGl.Feature;
+require('mapbox-gl/dist/mapbox-gl.css');
 
 const Map = ReactMapboxGl({
   accessToken: