Fix #1532 Add Phalcon\Assets\Collection::setTargetLocal

See #1532
```php
	public function testIssue1532()
	{
		@unlink(__DIR__ . '/assets/production/1532.js');
		$di = new \Phalcon\DI\FactoryDefault();
		$assets = new \Phalcon\Assets\Manager();
		$assets->useImplicitOutput(false);
		$assets->collection('js')
			->addJs('unit-tests/assets/jquery.js')
			->join(true)
			->addFilter(new Phalcon\Assets\Filters\Jsmin())
			->setTargetPath(__DIR__ .'/assets/production/1532.js')
			->setTargetLocal(FALSE)
			->setPrefix('//phalconphp.com/')
			->setTargetUri('js/jquery.js');

		$this->assertEquals($assets->outputJs('js'), '<script type="text/javascript" src="//phalconphp.com/js/jquery.js"></script>' . PHP_EOL);
	}
```