Set a debug category for each base class and element.
Merge branch 'master' into gtk-doc
-Using a customized include file tuned for building documentation for
GStreamer CE libraries. These libraries use the Codec Engine
API so they can only be run in the target board,this means that part
of the documentation files should be generated in the target board
and maintained in git.

-Including the documentation files generated in a DM368 board.
Adding plugins documentation (work in progress)