contribs: Present years before name and email

Contributions are already grouped by years, so years of contributions for
the same person will be presented first. Such way to write is currently
more common.
contribs: Compress contribution years

Continous sequences of years will be now presented in a shortened form.
It means change from e.g. "2004,2005,2006,2008" into "2004-2006,2008"
representation.