LOG4NET-404 missing System.Core reference
LOG4NET-404 missing System.Core reference

git-svn-id: 30ef5e266603cd5843239286745b30584f0baa91@1539567 13f79535-47bb-0310-9956-ffa450edef68

twcclegg/log4net,freedomvoice/log4net,freedomvoice/log4net,twcclegg/log4net,freedomvoice/log4net,twcclegg/log4net,freedomvoice/log4net,twcclegg/log4net