Switch to using object urls so we don't need ajax for mapbox-gl-rtl-text plugin (issue #126)

src/libs/mapbox-rtl.js

@@ -0,0 +1,11 @@
+import MapboxGl from 'mapbox-gl/dist/mapbox-gl.js'
+
+// Load mapbox-gl-rtl-text using object urls without needing http://localhost for AJAX.
+const data = require("base64?mimetype=text/javascript!@mapbox/mapbox-gl-rtl-text/mapbox-gl-rtl-text.js");
+
+const blob = new window.Blob([window.atob(data)]);
+const objectUrl = window.URL.createObjectURL(blob, {
+  type: "text/javascript"
+});
+
+MapboxGl.setRTLTextPlugin(objectUrl);