* properly separate data members and member functions, don't mix them
in the same public/private/protected section
-* conditional includes should be indended:
+* conditional includes should be indented:
#ifdef FOOBAR
# include "foobar.hpp"
#endif
+* use #include <> for libraries in external/
+
* include guards are of the form:
#ifndef HEADER_SUPERTUX_{PATH}_{FILE}_HPP