code: function(callback){
      var argFiles,
          filePath,
          i;
  
      if(!program.files || program.files.length === 0){
          return callback(null, true);
      }
  
      argFiles = program.files.split(',');
  
      output("Loading files...");
  
      for(i=0; i<argFiles.length; i++){
          filePath = path.resolve(__dirname, argFiles[i].toString());
          output("Reading file..." + filePath);
          if(fs.existsSync(filePath)){
              files.push(fs.readFileSync(filePath));
          }else{
              return callback("File does not exist, " + filePath, false);
          }
      }
  
      callback(null, true);
  }
docs: Loads a file/s from the argument
  @param  {String} path The path of the file to load
  @param  {Function} callback Callback to async with error or success