removed std::cout and std::cin from dump.hpp, added ostream argument to print(), removed default constructor from both dump_reader and dump_writer
removed std::cout and std::cin from dump.hpp, added ostream argument to print(), removed default constructor from both dump_reader and dump_writer

stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/stan,stan-dev/math,stan-dev/stan,stan-dev/stan,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/stan,stan-dev/stan