Python bindings

[nkhedekar]

A pure python solution takes above 100ms to convert pointclouds ROS<->Open3d. It would be good to have python bindings using pybind11 for this to be faster.

[tiesus]

Hey, I think since Open3d is intended to be a python library, with much better python than c++ documentation, python bindings would be great. Is there any progress?

[nkhedekar]

Unfortunately not but your PR is appreciated :)
Work in progress: #29