Python 3

[jayvdb]

Would you be interested in a patch for Python 3 support? (I prefer a pure python solution)

> python -m pip install --user -e .
Obtaining file:///home/jayvdb/projects/yaml/yq
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/home/jayvdb/projects/yaml/yq/setup.py", line 4, in <module>
        from itertools import imap, ifilter
    ImportError: cannot import name 'imap'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /home/jayvdb/projects/yaml/yq/