OVR(SVC()) fails with decision_function_shape="ovr"

This fails in `predict`:

``` python
from sklearn.svm import SVC
from sklearn.multiclass import OneVsRestClassifier

from sklearn.datasets import make_blobs

X, y = make_blobs()

clf = OneVsRestClassifier(SVC(decision_function_shape='ovr')).fit(X, y)
clf.predict(X)
```
