remove experimental option in favor of a stage option

test/core/fixtures/transformation/es6-block-scoping/exec-collision-array-comprehension/options.json

@@ -1,3 +1,3 @@
 {
-  "experimental": true
+  "stage": 0
 }

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

@@ -1,3 +1,3 @@
 {
-  "experimental": true
+  "stage": 0
 }

test/core/fixtures/transformation/es7-comprehensions/options.json

@@ -1,4 +1,4 @@
 {
-  "experimental": true,
+  "stage": 0,
   "blacklist": ["es6.tailCall"]
 }

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

@@ -1,3 +1,3 @@
 {
-  "experimental": true
+  "stage": 0
 }

test/core/fixtures/transformation/runtime/options.json

@@ -1,4 +1,4 @@
 {
   "optional": ["runtime"],
-  "experimental": true
+  "stage": 0
 }

test/core/generation.js

@@ -29,7 +29,6 @@ _.each(helper.get("generation"), function (testSuite) {
         var actualAst  = parse({
           filename: actual.loc,
           nonStandard: true,
-          experimental: true,
           strictMode: false,
           sourceType: "module",
           features: {

test/core/regenerator.js

@@ -12,7 +12,7 @@ suite("regenerator", function () {
   setup(function () {
     require("../../register")({
       blacklist: ["strict"],
-      experimental: true
+      stage: 0
     });
   });
 

test/core/traceur.js

@@ -94,7 +94,7 @@ require("./_transformation-helper")({
   ]
 }, {
   optional: ["es6.symbols"],
-  experimental: true
+  stage: 0
 }, function (opts, task) {
   if (!_.contains(task.exec.loc, "module.js")) {
     opts.blacklist = ["strict"];