[pdf417-sample] updated readme file and added example of how to retrieve binary barcode elements
[pdf417.embeddedframework] added convenience method 'getAllData' that returns NSData with all barcode bytes
[pdf417.embeddedframework] fixed bug in decoding some barcodes; more stable barcode detection
[Sample] Sample app update with new code for choosing resolution
[Docs] Documentation update
[pdf417.embeddedframework] fixed bug in license check