Added some things to be able to set and get the max logging level.
Used the Hi and Lo booleans in the writer threads.
Fixed the destructor to correctly shutdown the Hi and Lo threads.
Changed the init of the ostream to be set to the C++11 nullptr.
Capitalized the log level when it is output
Changed the init of the ostream for the Logger to use cout.rdbuf directly in the constructor of the ostream.