Add support for responsive images

[Gustav Lindqvist]

Add support for Ghosts feature for responsive images

Use Ghosts Casper themes configuration settings for image sizes to minimize amount of extra work for server.

"config": {
    "image_sizes": {
        "xxs": {
            "width": 30
        },
        "xs": {
            "width": 100
        },
        "s": {
            "width": 300
        },
        "m": {
            "width": 600
        },
        "l": {
            "width": 1000
        },
        "xl": {
            "width": 2000
        }
    }
}

[Gustav Lindqvist]

Image display sizes per location

Feed

• Normal post usually maxes out at 750px
• Featured post can be as large as 1500px

Post

• As large as the screen, should be at least 2000px