code: function(src, dest){
        if(fs.existsSync(dest)){
          this.waitForResponse(src, dest); 
        }else{
          this.copy(src, dest); 
          this.triggerNext(); 
        }
      }
docs: tries to install the source file to the destination path, if it exsits
  in the destination will trigger a prompt.
  
  @param  {String} src  fullpath of source file to install
  @param  {String} dest fullpath of destination file to install