Merge pull request #219 from serj-lotutovici/sl/to_string

Make ArrayJsonAdapter implement toString().

moshi/src/main/java/com/squareup/moshi/ArrayJsonAdapter.java

@@ -69,4 +69,8 @@ final class ArrayJsonAdapter extends JsonAdapter<Object> {
     }
     writer.endArray();
   }
+
+  @Override public String toString() {
+    return elementAdapter + ".array()";
+  }
 }