Fixes Jest tests when using it with newer versions of jsdom.

[fabiomcosta]

When updating JSdom to the newer version that is compatible with node, 3.1.2, npm test will throw some errors.

 FAIL  HasteModuleLoader/__tests__/HasteModuleLoader-genMockFromModule-test.js
TypeError: Cannot call method 'appendHtmlToDocument' of undefined
  at setInnerHTML (/Users/fabs/Dev/fb/jest/node_modules/jsdom/lib/jsdom/level1/core.js:48:22)
  at HTMLDocument.inheritFrom.write (/Users/fabs/Dev/fb/jest/node_modules/jsdom/lib/jsdom/level1/core.js:1706:7)
  at Object.exports.jsdom (/Users/fabs/Dev/fb/jest/node_modules/jsdom/lib/jsdom.js:59:7)
  at new JSDomEnvironment (/Users/fabs/Dev/fb/jest/src/JSDomEnvironment.js:32:47)
  at TestRunner.runTest (/Users/fabs/Dev/fb/jest/src/TestRunner.js:322:13)
  at onMessage (/Users/fabs/Dev/fb/jest/src/TestWorker.js:50:25)
  at Socket.<anonymous> (/Users/fabs/Dev/fb/jest/node_modules/node-worker-pool/nodeWorkerUtils.js:39:11)
  at Socket.emit (events.js:95:17)
  at Socket.<anonymous> (_stream_readable.js:765:14)
  at Socket.emit (events.js:92:17)
  at emitReadable_ (_stream_readable.js:427:10)
  at emitReadable (_stream_readable.js:423:5)
  at readableAddChunk (_stream_readable.js:166:9)
  at Socket.Readable.push (_stream_readable.js:128:10)
  at Pipe.onread (net.js:529:21)

require('jsdom') needs to happen before the other jsdom requires because some internal states are setup on that first call, and the second call depend on those.
After this change tests started passing just fine. I also tested with the current jsdom version and everything is fine too.

[DmitrySoshnikov]

@fabiomcosta, which new version of jsdom are you using? We have an issue to update to the newer version, see #221. If it's unrelated, the PR looks good to me. CC @zpao

[fabiomcosta]

@DmitrySoshnikov this doesn't actually updates to the newwst JSDOM that supports node (3.1.2) but it makes it work with it. So in the future when this happens we are going to be ready.

[DmitrySoshnikov]

OK, sounds good, thanks!

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