Bookmarklets to make it easier to work with GitHub diffs in GitHub. To use them, add a new bookmark with "javascript: " and then the code below. Use when viewing commit or Pull Request diffs.

HideUnityFiles.js

String.prototype.endsWith = function(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
};

$('.meta').each(function(index, value) {
    var path = $(value).data('path');
    
    if(path.endsWith('.unity') 
        || path.endsWith('.meta')
        || path.endsWith('.anim')
        || path.endsWith('.controller')
        || path.endsWith('.prefab')
        || path.endsWith('.asset')) {
        $(value).parent().hide();
    }
});

ShowAll.js

String.prototype.endsWith = function(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
};

$('.meta').each(function(index, value) {
    $(value).parent().show();
});

@codeimpossible lol, thanks, it's now a blog post at: http://johnnycode.com/2014/05/20/improved-unity-diffs-in-github/