More RFC and customizing

1. Serial is compatible for bind without any manipulations YYYYMMDDHH
2. Add option --ns (-n) for adding your backup name servers to result zone-file (CF does not export its NS')

Security update

Add possibility to pass credentials through environment or through a file, in addition to command-line arguments

Full python2 and python3 support

1.4

v1.4 fix for python3 unicode

pypi compatible package

Package for those who dislike pypi.python.org