Ignore setup generated dirs

Signed-off-by: Michal Čihař <michal@cihar.com>
Support for running tests in Travis CI

Test against more python versions and lxml as well. The build for
current lxml seems to be broken.

Signed-off-by: Michal Čihař <michal@cihar.com>
Merge branch 'xml-testing'
Merge branch 'travis'