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_impl.hpp

@@ -39,7 +39,7 @@
 namespace Catch {
     NonCopyable::~NonCopyable() {}
     IShared::~IShared() {}
-    StreamBufBase::~StreamBufBase() throw() {}
+    StreamBufBase::~StreamBufBase() CATCH_NOEXCEPT {}
     IContext::~IContext() {}
     IResultCapture::~IResultCapture() {}
     ITestCase::~ITestCase() {}