code: function(src, dest){
        self.logger.warn('File at '+dest+' exists, overwrite?');
        
        rl.question('(yN) ', function(answer){
          switch(answer.toLowerCase()){
            case 'y':
              this.copy(src, dest); 
              this.triggerNext(); 
              break; 
            case 'n':
              this.triggerNext(); 
              break; 
            default:
              this.waitForResponse(src, dest); 
              break; 
          }
        }.bind(this)); 
      }
docs: prompts the user if we can overwrite the destination file
  
  @param  {String} src  the source file
  @param  {String} dest the destination file