Merge pull request #1 from admpub/patch-1

Update app.go
Merge pull request #2 from admpub/patch-1

增加Server集合Servers(Server1(App1,App2,AppN),Server2(App1,App2,AppN),Server...
add gopmfile for examples
Merge branch 'master' of github.com:lunny/xweb
some improved
add ptr and slice support for request vars to struct fields
Merge pull request #6 from admpub/patch-1

支持Gzip压缩页面和静态资源(默认css和js)，页面增加浏览器端缓存(发送Etag)，action.go中补充各种常用方法
resolved #3
merge dev
Merge pull request #2 from lunny/master

更新到最新版