Add words(), js_match(), and js_replace().
Minor formatting in docstrings.
Use pyd.to_string() for string conversion.
Add test case for empty match.
Add _Underscore class for enabling "_" instance instead of overloading Chain class.
PEP8.
Workaround missing "flags" argument in re.sub on Python 2.6.
Only convert to string if obj is not already a string.
Add deburr().