Merge branch 'release/0.4.1'
travis: Use git repository for sources, expand task versions
Merge pull request #5 from tbabej/master

travis: Use git repository for sources, expand task versions
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!
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' into develop
Add workaround for TW-1452 bug