added MooseVariableScalar.h and SystemBase.h include files to get rid of ...

added MooseVariableScalar.h and SystemBase.h include files to get rid of  errors related to the use of MooseVariableScalar and SystemBase objects.

src/userobjects/NekSideIntegralVariableUserObject.C

@@ -13,6 +13,8 @@
 /****************************************************************/
 
 #include "NekSideIntegralVariableUserObject.h"
+#include "MooseVariableScalar.h"
+#include "SystemBase.h"
 
 template<>
 InputParameters validParams<NekSideIntegralVariableUserObject>()