Insert small image to QR Code

[1dot75cm]

I think, it's very useful. It have following new features:

• insert small icon to QR Code by icon_img (support http, https, ftp protocol)
• resize and position for small icon by factor and box
• set front and background color with QR Code by fill_color and back_color
• python 2 & python 3

For example:

<img src="{{ qrcode(request.url, fill_color="#aaa", back_color="white") }}">
<img src="{{ qrcode(url_for('.post', id=post.id, _external=True), border=1, factor=5, icon_img="https://example.org/fedora.png", box=(50, 100)) }}">

The icon_img will be find image in static directory. The factory will adjust the image size to one-fifth of QRCode. The box will be set left: 50px and top: 100px for small icon.

Please visit blog to check QR Code image. @marcoagner

https://repo.fdzh.org/blog/api/v1.0/qrcode?url=https://www.google.com&version=10&correct=H&box_size=4&border=2&bcolor=ccc&fcolor=blue&icon=https://avatars0.githubusercontent.com/u/8544397&box=30,65

[1dot75cm]

Hi, @marcoagner Please review this pull request. Thanks.

[marcoagner]

Thank you, @1dot75cm! Just reviewed it and loved the new features. :+1: Updating pip right away. Check 26d2e732ed551252a3a51ed3fadb1625f215aea9 ;)