The match-statement-seeker in elixir-smie-next-token does not work quite right

It does not issue `"MATCH-STATEMENT-DELIMITER"` tokens at all in its current state for pattern matching statements separated by blank lines. However, if I change this line:

``` elisp
(not (or (string= "\n" token) (string= ";" token))))
```

to this:

``` elisp
(not (string= ";" token)))
```

it emits the tokens fine.
