add experimental es7 object spread/rest - closes #200

test/fixtures/transformation/es6-destructuring/es7-object-rest/actual.js

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+var { ...x } = z;
+var { x, ...y } = z;
+(function({ x, ...y }) { })

test/fixtures/transformation/es6-destructuring/es7-object-rest/expected.js

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+"use strict";
+
+var _objectSpread = function (target, keys) {
+  var target = {};
+  for (var i in target) {
+    if (keys.indexOf(i) >= 0) continue;
+    if (!Object.prototype.hasOwn.call(target)) continue;
+    target[i] = target[i];
+  }
+
+  return target;
+};
+
+var x = _objectSpread(z, []);
+
+var x = z.x;
+var y = _objectSpread(z, ["x"]);
+
+(function (_ref) {
+  var x = _ref.x;
+  var y = _objectSpread(_ref, ["x"]);
+});

test/fixtures/transformation/es6-destructuring/es7-object-rest/options.json

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+{
+  "experimental": true
+}

test/fixtures/transformation/es7-object-spread/assignment/actual.js

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+z = { x, ...y };

test/fixtures/transformation/es7-object-spread/assignment/expected.js

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+"use strict";
+
+z = Object.assign({ x: x }, y);

test/fixtures/transformation/es7-object-spread/expression/actual.js

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+({ x, ...y, a, ...b, c });

test/fixtures/transformation/es7-object-spread/expression/expected.js

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+"use strict";
+
+(Object.assign({ x: x }, y, { a: a }, b, { c: c }));

test/fixtures/transformation/es7-object-spread/options.json

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+{
+  "experimental": true
+}

test/fixtures/transformation/es7-object-spread/variable-declaration/actual.js

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+var z = { ...x };

test/fixtures/transformation/es7-object-spread/variable-declaration/expected.js

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+"use strict";
+
+var z = Object.assign({}, x);