Account for Mono now wrapping exceptions during XML deserialization
Account for Mono now wrapping exceptions during XML deserialization

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