Fix replacing of existing child node by name
Restore some code style breaks
Fix tree element self-wrapping and return value
Extend test with string argument scenario
Merge branch 'fix/empty-attributes-render' into fix/wrap-children

Conflicts:
	src/HtmlObject/Traits/TreeObject.php
Update tests to changed return value of `wrapWith()`
Merge pull request #17 from velosipedist/fix/wrap-children

Fix/wrap children