Implemented QR decode stage using zbar library.
Added parameter to draw boundary of QR code.
Adding sample json script.
Merge pull request #7 from simonfojtu/qrdecode

QR detect and decode stage
Optional build of Zbar based QR decoder.
Merge pull request #8 from simonfojtu/qrdecode

Optional build of Zbar based QR decoder.
Fixed CMakeLists.txt.
Merge pull request #9 from simonfojtu/qrdecode

Fixed CMakeLists.txt.