Feature: recognize both horizontal and vertical barcodes.

[stevesum]

Sometime my users can't understand why the scanner don't recognize the barcode if they are in the area. In the default barcode scanner of the iOS (from version 7, AV Foundation framework) can recognize them on every position. code examples here: https://github.com/jpwiddy/iOS7-BarcodeScanner http://www.infragistics.com/community/blogs/torrey-betts/archive/2013/10/10/scanning-barcodes-with-ios-7-objective-c.aspx