Error in `test_namespace_gets_stripped_from_table_name` (Travis Build 35)

Courtesy of Travis [build 35](https://travis-ci.org/kla/php-activerecord/jobs/6581275):

```
1) ActiveRecordTest::test_namespace_gets_stripped_from_table_name
ReflectionException: Class NamespaceTest\NamespaceTest\Book does not exist
```

I think this might be related to changes introduced by @brianmuse in #294, which definitely seems like the correct solution, so my gut tells me the test is probably screwed up.