Indentation fails when there is a plus at the end of the previous line

When writing #201 I found out that general indentation fails when there is a plus at the end of the previous line.

When you press return after typing this:

``` javascript
randomFunctionCall('blaaaaaaaaaaaaaa ' + 
                  'and some more bla',
```

 you get send back to the indent of `randomFunctionCall` instead of the indent of the last line.
