Update setup_frappe.sh

package ius-release is using other name so script fail because dont find the package

more info:

http://dl.iuscommunity.org/pub/ius/stable/CentOS/6/x86_64/repoview/ius-release.html
change gunicorn cwd to sites dir
fix migrate3to4
Merge pull request #48 from williamjmorenor/patch-2

Update setup_frappe.sh
Update setup_frappe.sh
add bench shell fix #47
Merge pull request #1 from frappe/master

update