Conditionally removes usage of deprecated features

-add macros to test for C++ version and features
to catch_compiler_capabilities.hpp
- replaces dynamic exception specifications (deprecated)
with noexcept in C++ Version >= 11
- defines defaulted copy constructor/move constructors/assignment
in C++ Version >= 11 since their implicit generation is deprecated
under some circumstances.
- fixes #259

include/internal/catch_expression_lhs.hpp

@@ -14,14 +14,21 @@
 
 namespace Catch {
 
-// Wraps the LHS of an expression and captures the operator and RHS (if any) - wrapping them all
-// in an ExpressionResultBuilder object
+// Wraps the LHS of an expression and captures the operator and RHS (if any) -
+// wrapping them all in an ExpressionResultBuilder object
 template<typename T>
 class ExpressionLhs {
-    void operator = ( ExpressionLhs const& );
+    ExpressionLhs& operator = ( ExpressionLhs const& );
+#  ifdef CATCH_CPP11_OR_GREATER
+    ExpressionLhs& operator = ( ExpressionLhs && ) = delete;
+#  endif
 
 public:
     ExpressionLhs( T lhs ) : m_lhs( lhs ) {}
+#  ifdef CATCH_CPP11_OR_GREATER
+    ExpressionLhs( ExpressionLhs const& ) = default;
+    ExpressionLhs( ExpressionLhs && )     = default;
+#  endif
 
     template<typename RhsT>
     ExpressionResultBuilder& operator == ( RhsT const& rhs ) {