Remove RAF polyfill from lib/index

Author: rreusser

src/lib/index.js

@@ -13,8 +13,6 @@ var d3 = require('d3');
 
 var lib = module.exports = {};
 
-require('./request_animation_frame');
-
 lib.nestedProperty = require('./nested_property');
 lib.isPlainObject = require('./is_plain_object');
 lib.isArray = require('./is_array');