API: Make wrapper's constructor accept const wrapper
API: Changed namespace of DECLARE_EVENT_KEYWORD

It should add keyword::name not to blackhole's namespace but to
namespace where it is declared
Compilation: Added missed include of config.hpp
Merge pull request #23 from euroelessar/master

Changes in API and fixes in compilation.
[Aux] Implementation file is not acceptable here.
[Wrapper] Move constructor is checked.
[Wrapper] Move assignment operator has been tested.
[Tasks] One task more.
[API] Wrapper now provides underlying logger type.
[Code Style] Light renaming done.