Added cpp files to doxygen input.
Added cpp files to doxygen input.


davidsminor/cortex,danieldresser/cortex,appleseedhq/cortex,hradec/cortex,danieldresser/cortex,hradec/cortex,lento/cortex,danieldresser/cortex,goddardl/cortex,goddardl/cortex,hradec/cortex,davidsminor/cortex,davidsminor/cortex,danieldresser/cortex,lento/cortex,goddardl/cortex,appleseedhq/cortex,davidsminor/cortex,appleseedhq/cortex,lento/cortex