Switch from Ember to ember-copy

See emberjs/rfcs#322

addon/animate.js

@@ -1,6 +1,6 @@
 /* jshint newcap: false */
 import Promise from "./promise";
-import Ember from "ember";
+import { copy } from 'ember-copy'
 import Velocity from "velocity";
 
 // Make sure Velocity always has promise support by injecting our own
@@ -28,7 +28,7 @@ export function animate(elt, props, opts, label) {
   if (!opts) {
     opts = {};
   } else {
-    opts = Ember.copy(opts);
+    opts = copy(opts);
   }
 
   // By default, we ask velocity to clear the element's `display`

addon/transitions/explode.js

@@ -1,4 +1,5 @@
 import Ember from "ember";
+import { copy } from 'ember-copy'
 import { Promise } from "liquid-fire";
 
 // Explode is not, by itself, an animation. It exists to pull apart
@@ -30,7 +31,7 @@ export default function explode(...pieces) {
 }
 
 function explodePiece(context, piece, seen) {
-  var childContext = Ember.copy(context);
+  var childContext = copy(context);
   var selectors = [piece.pickOld || piece.pick, piece.pickNew || piece.pick];
   var cleanupOld, cleanupNew;
 

package.json

@@ -23,6 +23,7 @@
     "broccoli-merge-trees": "^1.0.0",
     "broccoli-stew": "^1.4.2",
     "ember-cli-babel": "^6.3.0",
+    "ember-copy": "^1.0.0",
     "ember-cli-htmlbars": "^2.0.1",
     "ember-cli-version-checker": "^2.0.0",
     "ember-getowner-polyfill": "^2.0.1",