Problem:    Filetype not detected for C++ header files without extension.
Solution:   Recognize the file by the Emacs file mode. (Dmitry Ilyin,
            closes #4593)

Add Serbian translations and spell checking.

Problem:    Python2 and python3 detection not tested. (Matej Cepl)
Solution:   Add test for detecting python2 and python3.  Also detect a script
            using "js" as javascript.

Problem:    Clojure now supports a shebang line.
Solution:   Detect clojure script from the shebang line. (David Burgin,
            closes #2570)

Problem:    Occasional crash when using a channel. (Marek)
Solution:   Decrement reference count later. (closes #2315)

Problem:    Loading file type detection slows down startup.
Solution:   Move functions to an autoload script.