Remove unused deps, add stand-alone polyfill for weakmap

.babelrc

@@ -0,0 +1,5 @@
+{
+    "presets": ["es2015"],
+    "compact": false,
+    "plugins": ["transform-class-properties"]
+}

.nvmrc

@@ -0,0 +1 @@
+8

config/gulp/tasks/test.js

@@ -3,6 +3,7 @@ import mocha from 'gulp-mocha';
 import path from 'path';
 import through2 from 'through2';
 import runSequence from 'run-sequence';
+import bluebird from 'bluebird';
 
 import babelConfig from '../../babel';
 

gulpfile.js

@@ -1,7 +1,8 @@
+const path = require('path');
+
 require('babel-register')({
   only: ['config'],
-  presets: ['./config/babel/node/dev'],
+  presets: [path.resolve('./config/babel/node/dev')],
   retainLines: true,
 });
-require('babel-polyfill');
 require('./config/gulp');

lib/index.js

@@ -1,11 +1,6 @@
-import 'babel-polyfill';
-import Promise from 'bluebird';
+require('weakmap-polyfill');
+
 const __DEV__ = process && process.env && process.env.NODE_ENV === 'development';
-Promise.config({
-  warnings: __DEV__,
-  longStackTraces: __DEV__,
-  cancellation: true,
-});
 
 import isStatelessComponent from './isStatelessComponent';
 import traverse from './traverse';