Correctness fixes (for VS)

internal/catch_capture.hpp

@@ -261,6 +261,8 @@ private:
 template<typename T>
 class Expression
 {
+	void operator = ( const Expression& );
+
 public:
     ///////////////////////////////////////////////////////////////////////////
     Expression

internal/catch_common.h

@@ -25,6 +25,7 @@
 
 #include <sstream>
 #include <stdexcept>
+#include <algorithm>
 
 namespace Catch
 {