Make `zifbin` compatible with Python3.
Make `zifbin` compatible with Python3.

Bring zifbin up to Python3 standards. Tested to work under both
Python2.7 and Python3.3 without changes.
Summary of changes:

  * Reference python via env, instead of python binary directly.
  * Switch print built-in to print() function
  * Move from has_key to the "in" keyword

zifnab06/zifb.in,zifnab06/zifb.in