/*
borrowed from: https://github.com/ryanmcgrath/wrench-js/blob/master/lib/wrench.js
wrench.rmdirRecursive("directory_path", callback);

Recursively dives through directories and obliterates everything about it.
function rmdirRecursive(dir, clbk){
    dir = resolve(dir).fullPath;
    
    if(clbk === null || typeof clbk === 'undefined') clbk = function(err) {};
    fs.readdir(dir, function(err, files) {
        if(err) return clbk(err);
        if(!files) return clbk(new Error('fsExt.rmdirRecursive: removing folders failed, folder not exists'));
        
        (function rmFile(err){
            if(err) return clbk(err);
            var filename = files.shift();
            if(filename === null || typeof filename === 'undefined') return fs.rmdir(dir, clbk);
            var file = dir+'/'+filename;
            
            fs.lstat(file, function(err, stat){
                if(err) return clbk(err);
                if(stat.isDirectory()) rmdirRecursive(file, rmFile);
                else fs.unlink(file, rmFile);
            });
        })();
    });
}