Installation fails with pip3

To reproduce this, rospkg and catkin-pkg also need to be installed to work with python3, e.g. using pip3:

$ pip3 install rospy-message-converter
Collecting rospy-message-converter
  Using cached https://files.pythonhosted.org/packages/c3/7d/5e153b0d7dea31faa4a12505ff04f26dce77716f97d963af2e165ac12984/rospy_message_converter-0.4.0.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-1zv7ys8z/rospy-message-converter/setup.py", line 8, in <module>
        package_dir={'' : 'src'},
      File "/usr/local/lib/python3.5/dist-packages/catkin_pkg/python_setup.py", line 74, in generate_distutils_setup
        package = parse_package(package_xml_path)
      File "/usr/local/lib/python3.5/dist-packages/catkin_pkg/package.py", line 513, in parse_package
        xml, filename = _get_package_xml(path)
      File "/usr/local/lib/python3.5/dist-packages/catkin_pkg/package.py", line 489, in _get_package_xml
        raise IOError('Path "%s" is neither a directory containing a "%s" file nor a file' % (path, PACKAGE_MANIFEST_FILENAME))
    OSError: Path "." is neither a directory containing a "package.xml" file nor a file
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-1zv7ys8z/rospy-message-converter/

[cjds]

https://pypi.org/project/rospy-message-converter/ has released a new version and now should work

[mintar]

The pip library was made by @cjds (see #14 and #25), so any questions about that should go to him.

It’s not quite easy to set up Python3 with ROS at the moment, so I’m not sure what the proper fix for this would be. Pull requests welcome.