---------------------
* Update PO-XLS convertors to allow selection of comments to include in
the xls files.
* Correct XML extractor to strip leading and trailing white. This fixes
`issue 1 <https://github.com/wichert/lingua/issues/1>`_.
* Add a very minimal polint tool to perform sanity checks in PO files.
* Update trove data: Python 2.4 is not supported due to lack of absolute
import ability.