Avoiding string temps, adding move operations, and removing manual reference counting

[ryankipp]

-Added const char * parameter to parts of the interface to allow for the option of preventing temp strings from being created -Added move operations to several locations where they could be used without much change to existing logic -Removed the SET_NUMBER macro in favor of templatization -Added unsigned long and long parameter versions of Node to help users avoid having to static_cast to one of the existing types -Removed manual reference counting and replaced with std::shared_ptr