Issue #13

Attempt to fix most obvious idioms related to issue #13 like

```python
if sys.version < '3':
    from urllib import urlopen
    from urlparse import urlparse
    import ConfigParser
    do_input = raw_input
else:
    from urllib.request import urlopen
    from urllib.parse import urlparse
    import configparser as ConfigParser
    do_input = input
```

Includes simplistic search for lowest common ancestor of nodes that could certainly be optimized.