Do not emit cast if the type is View.

This avoids compiler warnings for redundant casts.

I omitted tests for this because it would be challenging to make. Once #64 is in it would be much eaiser.

```
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Butter Knife (Parent) ............................. SUCCESS [0.900s]
[INFO] Butter Knife ...................................... SUCCESS [1:47.455s]
[INFO] Butter Knife Sample ............................... SUCCESS [9.186s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:58.318s
[INFO] Finished at: Sat Oct 05 19:55:03 PDT 2013
[INFO] Final Memory: 45M/475M
[INFO] ------------------------------------------------------------------------
```