Use a proper python package structure

[jacobsvante]

I removed the python 2 version and kept what was in the python3 package. If you still need the python2 folder you should create a branch for it instead of keeping it in a subdirectory. At least if you want to follow Python and Git conventions.

[jacobsvante]

It should be noted that the convention with Python code these days is to be compatible with both py3 and py2 with the same codebase. To make sure that it's working in both environments there should be a test suite running tox or something similiar that tests multiple python versions. A CI tool like Travis CI is recommended to ensure that there are no regressions in Pull requests etc.