Don't load on browsers that support emoji natively

[pento]

This little snippet seems to accurately detect if emoji is supported in a browser:

if (!String.fromCodePoint) {
    /*!
    * ES6 Unicode Shims 0.1
    * (c) 2012 Steven Levithan <http://slevithan.com/>
    * MIT License
    **/
    String.fromCodePoint = function fromCodePoint () {
        var chars = [], point, offset, units, i;
        for (i = 0; i < arguments.length; ++i) {
            point = arguments[i];
            offset = point - 0x10000;
            units = point > 0xFFFF ? [0xD800 + (offset >> 10), 0xDC00 + (offset & 0x3FF)] : [point];
            chars.push(String.fromCharCode.apply(null, units));
        }
        return chars.join("");
    }
}

function doesSupportEmoji() {
    var context, smiley;
    if (!document.createElement('canvas').getContext) return;
    context = document.createElement('canvas').getContext('2d');
    if (typeof context.fillText != 'function') return;
    smile = String.fromCodePoint(0x1F604); // :smile: String.fromCharCode(55357) + String.fromCharCode(56835)

    context.textBaseline = "top";
    context.font = "32px Arial";
    context.fillText(smile, 0, 0);
    return context.getImageData(16, 16, 1, 1).data[0] !== 0;
}

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