Port to Node 4.

package.json

@@ -17,9 +17,6 @@
   ],
 
   "main": "src/node-capnp/capnp.js",
-  "peerDependencies": {
-    "es6-promise": "1.x"
-  },
   "scripts": {
     "install": "node ./build.js",
     "test": "node src/node-capnp/capnp-test.js"

src/node-capnp/capnp-test.js

@@ -22,7 +22,6 @@
 var fs = require("fs");
 var capnp = require("./capnp");
 var assert = require("assert");
-var Promise = require("es6-promise").Promise;
 var spawn = require("child_process").spawn;
 
 var goldenBinary;

src/node-capnp/capnp.js

@@ -45,7 +45,6 @@ try {
 }
 
 var v8capnp = require(modPath);
-var Promise = require("es6-promise").Promise;
 
 var importPath = [];
 for (var i in module.paths) {