Fixed trim() for single char strings (github #75)

include/internal/catch_console_colour_impl.hpp

@@ -16,7 +16,7 @@
 
 #ifdef CATCH_PLATFORM_WINDOWS
 
-#include "windows.h"
+#include <windows.h>
 
 namespace Catch
 {

include/internal/catch_interfaces_reporter.h

@@ -136,7 +136,7 @@ namespace Catch
         std::string::size_type start = str.find_first_not_of( "\n\r\t " );
         std::string::size_type end = str.find_last_not_of( "\n\r\t " );
         
-        return start < end ? str.substr( start, 1+end-start ) : "";
+        return start != std::string::npos ? str.substr( start, 1+end-start ) : "";
     }