Implement __getitem__ for Metrik.
Implement __getitem__ for Metrik.

bgyori/indra,johnbachman/indra,sorgerlab/belpy,sorgerlab/indra,sorgerlab/indra,johnbachman/indra,bgyori/indra,sorgerlab/belpy,johnbachman/indra,sorgerlab/indra,bgyori/indra,sorgerlab/belpy