Fix jshint require.

Fixed this crash:

```
1) jshint should pass for working directory:
     Error: Cannot find module './node_modules/jshint/src/cli.js'
      at Function.Module._resolveFilename (module.js:338:15)
      at Function.require.resolve (module.js:384:19)
      at Context.<anonymous> (/Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha-jshint/index.js:10:34)
      at Test.Runnable.run (/Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha/lib/runnable.js:211:32)
      at Runner.runTest (/Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha/lib/runner.js:358:10)
      at /Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha/lib/runner.js:404:12
      at next (/Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha/lib/runner.js:284:14)
      at /Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha/lib/runner.js:293:7
      at next (/Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha/lib/runner.js:237:23)
      at Object._onImmediate (/Users/mickeyreiss/personal_code/Yaniv-Core/node_modules/mocha/lib/runner.js:261:5)
      at processImmediate [as _immediateCallback] (timers.js:330:15)
```