优化Mac/Linux上的运行脚本，兼容fish shell

[lhtin]

在fish shell中执行raven命令时会报出下面的错误，需要在raven.sc的头部指定#!/bin/bash才行，为此优化了下运行脚本，新增了一个raven.sh文件，同时也更新了下安装脚本。

Failed to execute process '/usr/local/bin/raven'. Reason:
exec: Exec format error
The file '/usr/local/bin/raven' is marked as an executable but could not be run by the operating system.

另外注意发布时还需要同步更新下安装文档说明。