Simplify ZoneYearOffset by using LocalDate/LocalTime, instead of doing everything via fields.
Simplify ZoneYearOffset by using LocalDate/LocalTime, instead of doing everything
via fields.

zaccharles/nodatime,BenJenkinson/nodatime,zaccharles/nodatime,nodatime/nodatime,BenJenkinson/nodatime,malcolmr/nodatime,malcolmr/nodatime,zaccharles/nodatime,malcolmr/nodatime,nodatime/nodatime,zaccharles/nodatime,zaccharles/nodatime,zaccharles/nodatime,malcolmr/nodatime,jskeet/nodatime,jskeet/nodatime