* Merged in lp:~aaron-whitehouse/duplicity/0-8-merge_selection_tests
- Merge in TestExcludeIfPresent from 0.7-series, which tests the behaviour of
duplicity's --exclude-if-present option.
- Move and rename TestTrailingSlash2 test (was duplicate name) as in 0.7-series.
- Fix PEP error on adbackend.py.
- Add jottalib as a tox dep to fix pylint error.
- Remove unnecessary skipUnless Linux as per 0.7-series.