* Fixes so that a oneOf schema with a single sub-schema is simplified when SIMPLIFY_ONEOF_ANYOF is set to true
* Adjusts oneOf_array test to ensure that it is generated as an interface instead of being simplified
* Update ruby samples so that they no longer refer to a model that is now gone due to the schema being simplified
* replace removed forkMode
* remove junit runner where it's not needed
* update samples without skipping test files, but skip files named "FILES"
* revert overwriting custom tests, add custom java tests to list
* add one sample to CircleCI, fix various Java tests