beego: fix the Upper for the _method value
add more sql keywords
minor code refactor
Merge pull request #812 from ZhengYang/develop

More SQL keywords added and code cleanup
remove the go style
Update beego.go
fix not found when has mulit static dir

 robot &robots
fix the static file dir
fix the same name controller for UrlFor
Merge pull request #826 from SnailKnows/patch-2

Update beego.go
beego: flash add success & Set
update the isdir
beego: support router case sensitive
beego: improve static file index.html  simple code
fix #794
fix #814
fix #814
Insert pagination utilities from beego/wetalk. Refs #835.
Move pagination to utils/pagination. Refs #837, #835.
Document usage of utils/pagination. Refs #835.