Warning generated by the usage of deprecated 'typedef' feature.

When I compile dstep I'm getting those warnings which is very annoying:

```
../.dub/packages/mambo-0.0.7/mambo/mambo/util/Traits.d(154,39): Deprecation: typedef is removed
../.dub/packages/mambo-0.0.7/mambo/mambo/util/Traits.d(182,30): Deprecation: typedef is removed
```
