DOC: str.match should (obviously) be str.extract.
@danielballan can u stick an example in the actual doc string of extract if I have a chance (so when u look at the doc thru the API it shows up), eg http://pandas.pydata.org/pandas-docs/dev/generated/pandas.core.strings.StringMethods.extract.html?highlight=extract#pandas.core.strings.StringMethods.extract
 OK, will try to get to that this week.
