Add description to entities.
Merge branch 'staging' into augmenting276_add_descriptions_to_symbols
Merge branch 'logic_specific_parsing_callbacks' into augmenting276_add_descriptions_to_symbols
adjust test to match for inclusion, not equality.
parse add child-symbol hashes to parent hash.
determine whether a given axiom is an annotation.
utilize pre_axiom callback to parse descriptions.
add hets-output fixture files for Pizza.
add spec for entity-description testing.
replace entity-description with label and comment.
adjust spec for desc-label-comment-replacement.
parse labels as well as comments for entities.
Removed omitable migrations before merging into staging.
Merge pull request #448 from ontohub/augmenting276_add_descriptions_to_symbols

Add comment and label attributes to entities. Fixes #276.