Creating a frame with wrong index length doesn't raise an error

This code doesn't raise an error while it should:
```python
>>> a = (np.random.rand(100,4)>0.9).astype(int)
>>> sf = SparseFrame(a, index=list('ABCD'))
```
But what's interesting, error is raised in `__repr__`:
```python
>>> sf
...
ValueError: Shape of passed values is (4, 5), indices imply (4, 4)
```
And this error still looks odd: shape of passed data was (100,4), not (4,5).