Fixed typo.
Updated to use new versions.
Fixed a set of PEP:s
ixed at set of # Ange incheckningsmeddelandet för dina ändringar. Rader som inleds
Added regression test for possible bug.
Modified code so that all doctests work with python2.7

by using explicit inheritance from object and
IGNORE_EXCETION_DETAIL was use to bridge the version gap.
Modifed code to make it backwards compatible.
Bumped version to 1.20.