regexp comparision not properly compiled

This is valid livescript regex comparsion:

```ls
prod = /production/i != process.env.NODE_ENV
```

Which produces te expected following output:

```js
var prod;
prod = !/production/i.test(process.env.NODE_ENV)
```

However livescript-next does not produces such output:

```js
prod = /production/i !== process.env.NODE_ENV;
```

Regards