Fixed the issue of len not working with the result of db query. (webp…

…y#554)

* Fixed the issue of len not working with the result of db query.

The earlier implentation was adding an __len__ function to the result
object and that worked fine for old-style classes. With old-style
classes gone in Python 3, that started giving trouble. Fixed it by
writing a ResultSet class and a special SqliteResultSet which doesn't
support len, but supports bool.

Fixes webpy#547.

* cleanup of db tests.

switched to setuptools

Bumped version to 0.38 and updated ChangeLog

Added ChangeLog.

web.py 0.36 released.

Changes for 0.35

support for filenames in web.sendmail attachments (tx gregglind)

tag 0.32 release

support for lists in db queries

tagging verion 0.3