RE 6805 Refactor SelectionNotificationService class

Commenting out test, due to link error on windows:
SelectionNotificationServiceTest.obj : error LNK2019:
unresolved external symbol "public: static struct
QMetaObject const
MantidQt::API::SelectionNotificationServiceImpl::staticMetaObject

I don't have access to a windows development system
to fix this.

refs #6805

Code/Mantid/MantidQt/API/CMakeLists.txt

@@ -85,7 +85,7 @@ set( TEST_FILES
    InterfaceManagerTest.h
    MantidColorMapTest.h
    MantidQwtMatrixWorkspaceDataTest.h
-   SelectionNotificationServiceTest.h
+#  SelectionNotificationServiceTest.h
 )
 
 qt4_wrap_cpp ( MOCCED_FILES ${MOC_FILES} )