rename 6to5 to babel

package.json

@@ -19,6 +19,7 @@
   "license": "MIT",
   "dependencies": {
     "accepts": "^1.2.2",
+    "babel": "^4.0.1",
     "co": "^4.4.0",
     "composition": "^2.1.1",
     "content-disposition": "~0.5.0",
@@ -43,7 +44,6 @@
     "vary": "^1.0.0"
   },
   "devDependencies": {
-    "6to5": "^3.6.5",
     "istanbul-harmony": "~0.3.0",
     "make-lint": "^1.0.1",
     "mocha": "^2.0.1",

test/experimental/async.js

@@ -1,6 +1,6 @@
 
 /**
- * Separate file primarily because we use `require('6to5/register')`.
+ * Separate file primarily because we use `require('babel/register')`.
  */
 
 var request = require('supertest');

test/experimental/index.js

@@ -1,4 +1,4 @@
-require('6to5/register')({
+require('babel/register')({
   optional: ['asyncToGenerator']
 });
 require('./async');