Add src directory to include path. Sync makefiles external with the current revision.
Add src directory to include path.
Sync makefiles external with the current revision.

svn path=/trunk/hubbub/; revision=6840

servo/libhubbub,prepare/netsurf_libhubbub,servo/libhubbub,adamwight/wmf-parsoid-libhubbub,prepare/netsurf_libhubbub,adamwight/wmf-parsoid-libhubbub,prepare/netsurf_libhubbub,Achal-Aggarwal/hibbub,Achal-Aggarwal/hibbub,adamwight/wmf-parsoid-libhubbub,servo/libhubbub,servo/libhubbub,prepare/netsurf_libhubbub,prepare/netsurf_libhubbub,adamwight/wmf-parsoid-libhubbub,adamwight/wmf-parsoid-libhubbub,prepare/netsurf_libhubbub,Achal-Aggarwal/hibbub,Achal-Aggarwal/hibbub,servo/libhubbub