Fix importing. Make this work in Python3

[IshitaTakeshi]

Fix importing

I modified __init__.py since I got an error below when importing.

>>> import ksvd
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.5/site-packages/ksvd/__init__.py", line 1, in <module>
    from ksvd_wrapper import KSVD, KSVD_Encode
ImportError: No module named 'ksvd_wrapper'

Make pyksvd compatible with Python 3

I just applied 2to3.

[rahulranjan29]

Is there any chance of this installing in Windows ?I'm facing issues installing this in windows .