Apply PR from PyQRCode

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Apply the pull requests from https://github.com/mnooner256/pyqrcode

See also mnooner256#52

• Update README.md, see e42e2b9
• [ ] Add qrprint as CLI application See issue Provide CLI script to output QR Codes #4
• Fix for issue #50, to ignore errors on shiftjis encoding, see 0dcc047
• [ ] Feature: Optional Pillow/PIL Leave this out
• Slightly faster PNG generation, improved Py2 vs Py3 compatibility, see d5c72aa
• ENH: code to handle QR special text , see 4e5ca98