Use new scheme and bump version. 
All tests fail due to scheme incompatibility
Update nested to automatically wrap the stuff in a container element
Updated structure to match new schema, fixed some tests to use new
naming
Fix attach tests by changing element lookup thingy
Fix element lookup path
Fix hierarcy tests by changing element names
Fix severity cases
Add step model to use name instead of title and step tests
Fix traces test by fixing fixture
Merge pull request #5 from allure-framework/upstream-1.3

Upstream 1.3