Merge branch 'master' of https://github.com/hotzenklotz/c3 into hotzenklotz-master

c3.js

@@ -3962,7 +3962,7 @@
     }
 
     if (typeof window.define === "function" && window.define.amd) {
-        window.define(c3);
+        window.define("c3", ["d3"], c3);
     } else {
         window.c3 = c3;
     }