Changed "const X ref"s to "X const ref"s

- Brought older code up to current convention (with the help of a Python script)

include/internal/catch_interfaces_generators.h

@@ -21,7 +21,7 @@ namespace Catch {
     struct IGeneratorsForTest {
         virtual ~IGeneratorsForTest();
 
-        virtual IGeneratorInfo& getGeneratorInfo( const std::string& fileInfo, std::size_t size ) = 0;
+        virtual IGeneratorInfo& getGeneratorInfo( std::string const& fileInfo, std::size_t size ) = 0;
         virtual bool moveNext() = 0;
     };