Add python 2 support.

[twistor]

Trying to use this on Fedora 25 and having problems because it's using python 2.

[mkusher]

omg, but than python3 support will be broken?

[twistor]

No, this doesn't change the behavior for Python 3. The only difference is that the imports have changed from 2 to 3. So, we try to import from Python 3, and if that fails, try to import from Python 2.

try:
    from urllib.parse import urlencode
    from urllib.request import urlopen
    from urllib.request import Request
    from urllib.request import URLError
except ImportError:
    from urllib import urlencode
    from urllib2 import urlopen
    from urllib2 import Request
    from urllib2 import URLError

[mkusher]

oh, I see, thx!