Evcxr image

Integration between Evcxr Jupyter and the image crate. Enables display of images in Evcxr Jupyter kernel.

Currently only supports: * RgbImage * GrayImage

Example usage: ```rust extern crate evcxr_image; extern crate image;

use evcxr_image::ImageDisplay;

image::ImageBuffer::from_fn(256, 256, |x, y| { if (x as i32 - y as i32).abs() < 3 { image::Rgb([0, 0, 255]) } else { image::Rgb([0, 0, 0]) } }) ```