Allow using multiple views in StaticRenderer in parallel

[eckardt]

I was playing around with webloop for a bit and found out that the StaticRenderer.ServeHTTP method doesn't allow to be run by more than one thread at the same time due to the locking that takes place on viewLock. Is there a reason for this or would it be possible to instantiate a new view every time ServeHTTP is executed so we can render multiple pages in parallel?

I'm relatively new to Go and would be glad if you can point me in the right direction.