code refact
	modified:   src/Makefile.am
	modified:   src/Makefile.in
	modified:   src/context.cpp
	modified:   src/context.h
	new file:   src/luahelper.cpp
	new file:   src/luahelper.h
	deleted:    src/luawrapper.cpp
	deleted:    src/luawrapper.h
	modified:   src/main.cpp
	modified:   src/stringutil.cpp
	modified:   src/stringutil.h