delete float, complex - code changes

also:
	cmplx -> complex
	float64(1.0) -> 1.0
	float64(1) -> 1.0

R=gri, r, gri1, r2
CC=golang-dev
https://golang.org/cl/3991043

src/pkg/json/decode.go

@@ -749,7 +749,7 @@ func (d *decodeState) literalInterface() interface{} {
 		}
 		n, err := strconv.Atof64(string(item))
 		if err != nil {
-			d.saveError(&UnmarshalTypeError{"number " + string(item), reflect.Typeof(float64(0))})
+			d.saveError(&UnmarshalTypeError{"number " + string(item), reflect.Typeof(0.0)})
 		}
 		return n
 	}