[nodebb-plugin-image-sizer] Image resizing

[Almost]

Hi nodebb. Another friend from BitBangers here to show you my first plugin.

Trying to look through a thread of phone screenshots was just painful, so I made a little plugin to allow you to resize images.

The syntax is based loosely on the way iOS handles multple image sizes combined with normal markdown image embedding:
![alt text](http://someurl.com/someimage.png@<size>)

Size can take the following formats:
100x200 - Absolute size
100x x200 - Absolute size where the other dimension is calculated to maintain aspect ratio
50% - Percentage
0.5 - Scalar Multiplier

So for example, my original picture:
http://cl.ly/image/2L3F1M2E1X3l/IMG_0136.JPG
is 1000x750.
All of the following would produce the same image at 1/2 size:
![white house](http://cl.ly/image/2L3F1M2E1X3l/IMG_0136.JPG@500x375)
![white house](http://cl.ly/image/2L3F1M2E1X3l/IMG_0136.JPG@500x)
![white house](http://cl.ly/image/2L3F1M2E1X3l/IMG_0136.JPG@x375)
![white house](http://cl.ly/image/2L3F1M2E1X3l/IMG_0136.JPG@50%)
![white house](http://cl.ly/image/2L3F1M2E1X3l/[email protected])

Install via npm:
npm install nodebb-plugin-image-sizer

Source:
https://github.com/Kern--/nodebb-plugin-image-sizer

Known Issues:
Images that are set to be wider than their container become elongated (width is set to match the container, but height is not adjusted). This means that mobile can get a bit dicey.