APE-related problems:
* \t\t characters are not allowed by default in SnakeYAML (todo: jira issue for the enhancement). Converted to spaces.
* OpenJPA generates schema after APE is trying to seed. This is most likely happening when PersistentContext is created for the first time. When using Hibernate this happens during deployment, therefore APE runs ok. In case of OpenJPA I was forced to create sql script for creating schema.

Other fixes:
* Fixed DBPopulater class/filename mismatch.
* Added idea folder to ignore list.

As a side note: TomEE is somehow swallowing APE/ARQ exceptions. We need to investigate that