In mesh.py typo on attribute

On line https://github.com/vt-vl-lab/3d-photo-inpainting/blob/e6872a8/mesh.py#L764

`mesh.node` should be `mesh.nodes`, so

```python
mesh = refresh_node(single_edge_node, mesh.node[single_edge_node], new_node, dict(), mesh)
```

should be replaced by 

```python
mesh = refresh_node(single_edge_node, mesh.nodes[single_edge_node], new_node, dict(), mesh)
```