CSO's => CSOs

fixing apostrophes
moving and italicizing credit
unpacking acronym: OKFN => Open Knowledge Foundation
Identified challenges => Challenges
fixes #16
mostly fixes #11

... but the **Thanks** section still needs to be expanded (@lucyfedia should jump in here)
addresses some parts of #23
title change as per #21
adjusting titling, as per #20
fixes #18
the easy parts from #14
touches #8 (image still needs to be fixed)
Merge pull request #25 from nmashton/master

Changes to OSI report