Added doxygen output to the .hgignore list.
Added doxygen output to the .hgignore list.

turtleDev/gorilla-audio,zao/gorilla-audio,swistakm/gorilla-audio,zao/gorilla-audio,DavidGriffith/gorilla-audio,turtleDev/gorilla-audio,DavidGriffith/gorilla-audio