static file code refactor and bug fixed

https://github.com/astaxie/beego/pull/1376

Update context.go

all this status was setting in error.go, this line will cause multi-resp

bugfix: graceful failed when both enable http and https

fix #671

orm: Fix handling of rel(fk) to model with string pk

Fixed typos

XSRFFormHtml() should also generate XSRF token.

Fix dbBase.Update not returning error on failure

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error bug fixed and clean code