Merge branch 'release/0.4.1' into develop
Merge branch 'master' into develop
Temporarily remove tasklib v2.4.0beta2 from tested versions

The tests fail for some reason. 2.4.0 works just fine!
TaskFilter: Use empty string for None searches
Merge pull request #8 from tbabej/develop

TaskFilter: Use empty string for None searches
Update docs with new supported versions
Bump version for 0.5.0 release
Merge branch 'release/0.5.0'