[FEATURE] Python 3.x support

- change print statements
- change relative imports
[FEATURE] Python 3 support

- fix encoding
- use next()
[FEATURE] switch from str to bytes
[TEST] adopt test
[TODO] todo

- comment
[FIX] read current Python executable

- read current Python executable instead of assuming it is "python"
[FIX] make Python 3 compatible
Merge pull request #5 from hroest/feature/Python3

Feature/python3