non/spire — pull request #316 by denisrosset (2014-11-03 16:04:14+00:00)
Title: Consistent naming for combine/sum/prod.

Added combineOption, combine, combinen to Semigroup/Monoid/Group.
Added sumOption, sum, sumn to their additive variants.
Added prodOption, prod, prodn to their multiplicative variants.

Submitted for issue #298