port rev. 2820: Issue 1712 fix handling of start/stop chars
port rev. 2820:
Issue 1712 fix handling of start/stop chars

git-svn-id: 98f681d7a2907ee2a41df434552134740bcc8829@86719 81fbe566-5dc4-48c1-bdea-7421811ca204

dawidcieszynski/ZXing.Net,dawidcieszynski/ZXing.Net