Add new data to commits output (data.frame)

[maciekbanas]

E.g. author of the commit

[maciekbanas]

@Cotau

[maciekbanas]

Commits tables already have these cols: id, commited_date, author, additions, deletions, repository, organization.
Do we want any other data here? @Cotau @marcinkowskak @kalimu @epijim I open the discussion.