Drop dependency on future

This package doesn't explicitly say in its `setup.py` that it's meant to
be used only with Python 3, but in practice it's not compatible with
Python 2.

We no longer need to install `future` or use `from __future__` imports.

Author: DavidCain

clrenv/lazy_env.py

@@ -1,4 +1,3 @@
-from __future__ import print_function
 from builtins import object
 from glob import glob
 from itertools import chain

requirements.txt

@@ -1,5 +1,4 @@
 PyYAML==4.2b1
 munch==2.2.0
-future==0.16.0
 boto3==1.5.36
 -e git+https://github.com/ColorGenomics/[email protected]#egg=clrypt

setup.py

@@ -16,7 +16,6 @@
       install_requires=[
         'PyYAML>=4.2b1',
         'munch>=2.2.0',
-        'future==0.16.0',
       ],
       license = "MIT",
       )