Remove obsolete jshint options

This options are obsolete in 2.5.0 release

`"onecase"`:
* [Realte Issue Thread](https://github.com/jshint/jshint/issues/1249)
* [jshint.js src](https://github.com/jshint/jshint/blob/master/src/jshint.js#L157)

`"regexdash"`:
* [jshint.js src](https://github.com/jshint/jshint/blob/master/src/jshint.js#L159)

`"trailing"`:
* [JSHint 2.5.0 release](https://github.com/jshint/jshint/releases/tag/2.5.0)
* [jshint.js src](https://github.com/jshint/jshint/blob/master/src/jshint.js#L230)

Lint checker with options:
![react-master-jshint](https://cloud.githubusercontent.com/assets/182219/4782567/bf4165a6-5cfb-11e4-99ae-a4c7fbc32e86.png)

Lint checker without options:
![react-enaqx-jshint](https://cloud.githubusercontent.com/assets/182219/4782568/cf733a9e-5cfb-11e4-87b3-10188aa82c29.png)