fix Caffe2TensorToNumpyArray for py3

with python3 np.int defaults to int64.  This diff should fix it. I don't know if test exist for this function already, however following ASR test was breaking when i switch to py3

```
buck test caffe2/caffe2/fb/speech/asr_training/:tensor_parser_test
```
1 file changed
tree: c7d0fc0775159d36ff6e095a60bf4eca957ebe51
  1. .github/
  2. .jenkins/
  3. .travis/
  4. caffe/
  5. caffe2/
  6. cmake/
  7. conda/
  8. docker/
  9. docs/
  10. modules/
  11. scripts/
  12. third_party/
  13. .gitattributes
  14. .gitignore
  15. .gitmodules
  16. .travis.yml
  17. appveyor.yml
  18. CMakeLists.txt
  19. LICENSE
  20. Makefile
  21. NOTICE
  22. README.md
  23. release-notes.md
  24. setup.py
  25. VERSION_NUMBER
README.md

Caffe2

License Jenkins Build Status Appveyor Build Status

Caffe2 is a lightweight, modular, and scalable deep learning framework. Building on the original Caffe, Caffe2 is designed with expression, speed, and modularity in mind.

Questions and Feedback

Please use Github issues (https://github.com/caffe2/caffe2/issues) to ask questions, report bugs, and request new features.

Please participate in our survey (https://www.surveymonkey.com/r/caffe2). We will send you information about new releases and special developer events/webinars.

License

Caffe2 is released under the Apache 2.0 license. See the NOTICE file for details.

Further Resources on Caffe2.ai