Portable Installation

Hello,

Currently the ploy.ly MATLAB Setup does some nasty things:

1. Copy Plot.Ly into MATAB Toolbox folder.
2. Put files into User Folder.

I propose much simpler way and a portable way - Use only the folder plotly was copied into.
Only add that folder to MATLAB Path (If user wants that).

All can be done easily by changing few lines.

Thank You.

定位负责将 Plotly 复制到 MATLAB Toolbox 和 User 文件夹中的 MATLAB Setup 代码。阅读它当前如何安装文件以及管理 MATLAB path；完成标准是安装只使用复制的 Plotly 文件夹，而将该文件夹添加到 MATLAB path 则为可选操作。没有指定具体测试，因此请手动验证安装行为。