Update dependencies

Just a quick update of all the npm dependencies in this project, I also had to change the `.jshintrc` otherwise you'll get this warning:

```
>> ES5 option is now set per default
```

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**Changes:**
- Updated `read-package-json` to `~1.1.8`
- Updated `grunt-contrib-jshint` to `~0.10.0`
- Updated `grunt` to `~0.4.4`

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If you need anything else in this PR, please let me know. Thanks