Fix failing tests

[silbinarywolf]

1) SilbinaryWolf\Components\Tests\ComponentTest::testJSONProperty
Error: Call to undefined method SilverStripe\ORM\ArrayList::__set_state()
/tmp/silverstripe-cache-php7.0.25-home-travis-build-silbinarywolf-silverstripe-components/travis/.cache.d9b10103ef2fc33f8fcf73213fdcc7a872f053f8:4
/home/travis/build/silbinarywolf/silverstripe-components/vendor/silverstripe/framework/src/View/SSViewer.php:602
/home/travis/build/silbinarywolf/silverstripe-components/vendor/silverstripe/framework/src/View/SSViewer_FromString.php:62
/home/travis/build/silbinarywolf/silverstripe-components/tests/ComponentTest.php:452
/home/travis/build/silbinarywolf/silverstripe-components/vendor/phpunit/phpunit/phpunit:52
2) SilbinaryWolf\Components\Tests\ComponentTest::testJSONEscapedCharacters
Error: Call to undefined method SilverStripe\ORM\ArrayList::__set_state()
/tmp/silverstripe-cache-php7.0.25-home-travis-build-silbinarywolf-silverstripe-components/travis/.cache.3e983eed5268d322d0e1e3fe34f42953e9dd9607:4
/home/travis/build/silbinarywolf/silverstripe-components/vendor/silverstripe/framework/src/View/SSViewer.php:602
/home/travis/build/silbinarywolf/silverstripe-components/vendor/silverstripe/framework/src/View/SSViewer_FromString.php:62
/home/travis/build/silbinarywolf/silverstripe-components/tests/ComponentTest.php:485
/home/travis/build/silbinarywolf/silverstripe-components/vendor/phpunit/phpunit/phpunit:52
3) SilbinaryWolf\Components\Tests\ComponentTest::testJSONDeeplyNested
Error: Call to undefined method SilverStripe\ORM\ArrayList::__set_state()
/tmp/silverstripe-cache-php7.0.25-home-travis-build-silbinarywolf-silverstripe-components/travis/.cache.29214a899391977577634cd46d642e5b086426cf:4
/home/travis/build/silbinarywolf/silverstripe-components/vendor/silverstripe/framework/src/View/SSViewer.php:602
/home/travis/build/silbinarywolf/silverstripe-components/vendor/silverstripe/framework/src/View/SSViewer_FromString.php:62
/home/travis/build/silbinarywolf/silverstripe-components/tests/ComponentTest.php:584
/home/travis/build/silbinarywolf/silverstripe-components/vendor/phpunit/phpunit/phpunit:52

https://travis-ci.org/symbiote/silverstripe-components/jobs/412533152#L657

[nglasl]

@JoshuaCarter since you're most familiar with this, can you please investigate when you have some spare time?