Missing 3D meshes used in DensePose

Hi,

Could you please release the 3D meshes used in ```projects/DensePose```?
The 3D meshes released right now are just placeholders with all vertices and faces being equal to 0.
An example illustrating that follows:
```
import pickle
from detectron2.utils.file_io import PathManager
with PathManager.open("https://dl.fbaipublicfiles.com/densepose/meshes/cat_7466.pkl", "rb") as hFile:
data = pickle.load(hFile)
print(data)
```

Releasing the 3D meshes can facilitate further research in this field and is fairly easy to do (just upload some .pkl files).

Thank you in advance!