incompatibilities with python2

[d-acharya]

In addition to print statement, there are following inconsistencies with python 2

1. copy in base_model.py will not work. shape.copy() is not available in python2. Use
   target_shape=shape[:]
   or something similar.
2. imports need __init__.py in python earlier than 3.2. so import models.<> or import utils.<> will not work Alternative is to add sys.path.append('utils') and sys.path.append('models') as already done and then

from data import CelebA, RandomNoiseGenerator
from model import Generator, Discriminator