Fix errors when using rules in validation array

Normally with multiple rules the following syntax is used with multiple rules:

```php
->withRules([
    'foo' => ['required', new Rule()]
]);
```

But this is also valid syntax and will crash former when a Rule object is passed:

```php
->withRules([
    'foo' => new Rule()
]);
```

src/Former/Former.php

@@ -302,6 +302,10 @@ public function withRules()
 		foreach ($rules as $name => $fieldRules) {
 			$expFieldRules = $fieldRules;
 			if (!is_array($expFieldRules)) {
+				if (is_object($expFieldRules)) {
+					continue;
+				}
+
 				$expFieldRules = explode('|', $expFieldRules);
 				$expFieldRules = array_map('trim', $expFieldRules);
 			}

tests/LiveValidationTest.php

@@ -637,4 +637,15 @@ public function testCanIgnoreValidationRuleClasses()
 		$this->assertHTML($matcher, $input);
 		$this->assertControlGroup($input);
 	}
+
+	public function testCanIgnoreValidationRuleClassesWithoutArray()
+	{
+		$this->former->withRules(array('foo' => new \stdClass()));
+
+		$input   = $this->former->text('foo')->__toString();
+		$matcher = $this->matchField();
+
+		$this->assertHTML($matcher, $input);
+		$this->assertControlGroup($input);
+	}
 }