Given a matrix in python numpy which has for some of its rows, leading zeros. I need to shift all zeros to the end of the line.
E.g.

```
0 2 3 4
0 0 1 5
2 3 1 1

```

should be transformed to

```
2 3 4 0
1 5 0 0
2 3 1 1

```

Is there any nice way to do this in python numpy?