Added MapGet template func

Update router.go, add Flush for responseWriter

Fix #1269 extract godoc to own file.

typo fixed

registor==>register
innner ==> inner

Fix #1271 Add description from docs on beego.me to README
and also add same description to godoc

set DoRotate fname like xx.2013-01-01.2.log

Fix for #1256. Indent the code sample lines properly.

fix fname,by extension to identify the file type on mac and windows.

Fix #1237

Update validators.go

Support virtual operators paragraph 170！

Package description uses same text as the README.

fix FilterHandler crash issue 

Filter Handler will crash with error assignment to entry in nil map , params from function Tree.Match() maybe nil.

pull from stable

Revert "Revert "fix multiple filters execute issue""

Revert "fix multiple filters execute issue"

fix multiple filters execute issue

ex:
	beego.InsertFilter("/*", beego.BeforeExec, FilterLoginCheck1,false)
	beego.InsertFilter("/*", beego.BeforeExec, FilterLoginCheck2)

In function  FilterLoginCheck1 , I'll write data via ResponseWriter, and w.started = true
FilterLoginCheck2 won't be executed, it should be.

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