updated Logger.java

Signed-off-by: Bartek Zdanowski <bartek.zdanowski@gmail.com>
Update langs.properties to latest mod-lang-clojure
Bumping up mod-lang-groovy version

Signed-off-by: Horacio Gonzalez <horacio.gonzalez@gmail.com>
Throw IllegalArgumentException or send 404 if filename argument of sendFile(...) points to a directory and not a file.