staticFiles ignores tmp

Yesod/Helpers/Static.hs

@@ -127,6 +127,7 @@ getStaticRoute fp' = do
 
 notHidden :: FilePath -> Bool
 notHidden ('.':_) = False
+notHidden "tmp" = False
 notHidden _ = True
 
 getFileList :: FilePath -> IO [[String]]

Yesod/Yesod.hs

@@ -36,6 +36,7 @@ module Yesod.Yesod
 import Yesod.Content hiding (testSuite)
 import Yesod.Json hiding (testSuite)
 import Yesod.Handler hiding (testSuite)
+import qualified Data.ByteString.UTF8 as BSU
 #else
 import Yesod.Content
 import Yesod.Json