Simplify raises() by requiring type:Class<T>.

Now Haxe will be able to correctly interpret each argument, so we don't have to check `isFunction()`, so JS will work again.

src/utest/Assert.hx

@@ -661,8 +661,7 @@ class Assert {
    * @param type The type of the expected error. Defaults to any type (catch all).
    * @param condition The callback which is called upon an exception. The assertion passes
    *      if this callback returns `true`. Otherwise assertion fails. If `type` is specified, that
-   *      will have already been checked before the function is called. In JavaScript, you must
-   *      specify `type`.
+   *      will have already been checked before the function is called.
    * @param msgNotThrown An optional error message used when the function fails to raise the expected
    *      exception. If not passed a default one will be used
    * @param msgWrongType An optional error message used when the function raises the exception but it is
@@ -671,13 +670,7 @@ class Assert {
    * @param pos Code position where the Assert call has been executed. Don't fill it
    * unless you know what you are doing.
    */
-  public static function raises<T>(method:() -> Void, ?type:EitherType<Class<T>, Any>, ?condition:(e:T)->Bool, ?msgNotThrown : String , ?msgWrongType : String, ?msgWrongCondition : String, ?pos : PosInfos) : Bool {
-    #if !js
-    if(Reflect.isFunction(type)) {
-      condition = (type:Any);
-      type = null;
-    }
-    #end
+  public static function raises<T>(method:() -> Void, ?type:Class<T>, ?condition:(e:T)->Bool, ?msgNotThrown : String , ?msgWrongType : String, ?msgWrongCondition : String, ?pos : PosInfos) : Bool {
     var typeDescr = type != null ? "exception of type " + Type.getClassName(type) : "exception";
     try {
       method();