update
修正sqlsrv驱动
Merge remote-tracking branch 'upstream/master'
修正一处安全隐患
去除filter_exp函数
Merge remote-tracking branch 'upstream/master'
改进过滤机制
添加全局过滤机制（默认关闭）
I函数增加修饰符功能和正则检测支持
模型类_parseOptions中的检测机制调整回原来 避免使用同名数组表单数据的时候被转换
Update Think.class.php

89行加个\更规范点
修正一处错误
Merge pull request #222 from Wilsonjnliu/patch-1

Update Think.class.php 89行加个\更规范点
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'origin/upgrade' into develop
Merge branch 'master' into develop