Add support for python 3 ( >= 3.3) while keeping support for python 2.7.x.

Signed-off-by: David Black <dblack@atlassian.com>
The from __future__ import print_function should have been in cli.py -- this commits moves it(the import) into cli.py.

Signed-off-by: David Black <dblack@atlassian.com>
Merge pull request #1 from dbaxa/python_3_support

Add support for python 3 ( >= 3.3) while keeping support for python 2.7.x