port SHA-1: 02d3697a59087b87bdae6cb9c85e508f5de90c3d
port SHA-1: 02d3697a59087b87bdae6cb9c85e508f5de90c3d

* Remove spurious stack trace from singleton exception, and various minor edits


git-tfs-id: [https://tfs.codeplex.com/tfs/TFS05/]$/ZXingNet/trunk;C89774

DHMechatronicAG/ZXing.Net,micjahn/ZXing.Net,DHMechatronicAG/ZXing.Net,bsoja/ZXing.Net,micjahn/ZXing.Net,micjahn/ZXing.Net,bsoja/ZXing.Net,DHMechatronicAG/ZXing.Net,bsoja/ZXing.Net