Improve search: intitle, author, inurl

Allow multiple values of intitle: , author:, inurl:

Note: Tests for UserQueryTest are broken due to
https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.0.0#backwards-compatibility-issues

tests/app/Models/UserQueryTest.php

@@ -3,7 +3,7 @@
 /**
  * Description of UserQueryTest
  */
-class UserQueryTest extends \PHPUnit_Framework_TestCase {
+class UserQueryTest extends PHPUnit\Framework\TestCase {
 
 	public function test__construct_whenAllQuery_storesAllParameters() {
 		$query = array('get' => 'a');