QR Code encoder

This is the next incarnation of Lior Shapira's QR encoder, based on ZXing library.

It supports error correction levels, character sets other than ISO-8859-1 and the parameters are passed on more readable manner.
NB: using character set other than ISO-8859-1 will probably make QR code unreadable by any QR decoder, except ZXing's.
UTF-8 is set the default encoding!

The QR decoder is the same as Lior Shapira's, http://www.mathworks.com/matlabcentral/fileexchange/29239-qr-code-encode-and-decode