add cast<>() tests. including a vectorization_logic test that currently fails (casting to same type should not prevent vectorization)
diff --git a/test/vectorization_logic.cpp b/test/vectorization_logic.cpp
index 9a62982..db2fef3 100644
--- a/test/vectorization_logic.cpp
+++ b/test/vectorization_logic.cpp
@@ -50,6 +50,9 @@
     InnerVectorization,CompleteUnrolling));
   VERIFY(test_assign(Vector4f(),Vector4f().cwise() * Vector4f(),
     InnerVectorization,CompleteUnrolling));
+  VERIFY(test_assign(Vector4f(),Vector4f().cast<float>(),
+    InnerVectorization,CompleteUnrolling));
+
 
   VERIFY(test_assign(Matrix4f(),Matrix4f(),
     InnerVectorization,CompleteUnrolling));