Merge pull request #72 from tike/en-US

fixed spelling, grammar and style in the quickstart section.
Update cache.md

地址改了
Update httplib.md

req.ToJson(&result) 应该是取地址
Update httplib.md

req.ToXML(&result) 为取地址    func (b *BeegoHttpRequest) ToXML(v interface{}) error {
update groupRouter
Merge pull request #73 from xdeng/patch-1

Update cache.md
Merge pull request #74 from xdeng/patch-2

Update httplib.md
Merge pull request #75 from xdeng/patch-3

Update httplib.md
Update query.md

qs.Limit(10, 20)
// LIMIT 10 OFFSET 20 注意跟SQL反过来的

坑死我啦
Merge pull request #76 from xdeng/patch-4

Update query.md
Update jsonxml.md

https://github.com/beego/beedoc/blob/master/en-US/mvc/controller/jsonxml.md
https://github.com/astaxie/beego/blob/develop/controller.go#L272
中文版少了个 'p'
Merge pull request #78 from lowstz/patch-1

Update jsonxml.md
Adds FilterFunc signature
Merge pull request #79 from pjvds/patch-1

Adds FilterFunc signature
Update ParseForm example

This fixes the error in the example code for parsing form data. It used the `ParseForm` method directly on the controller, while this method is attached to the `revel.Request` type.
Merge pull request #80 from pjvds/patch-2

Update ParseForm example
update doc for beego 1.1.2
change the order
update release note
Update upgrade.md