Update FileHandler and tests, StepProcessor, MapOutput

* FileHandler: Adapted getCsvContent to use CsvParser. Adjusted tests to the change.
* StepProcessor: Minor style changes.
* MapOuptup: Minor style changes.
Update FileHandler

* FileHandler: Minor style update.
Update TestStepSpec, FileHandlerSpec, test-data

* Rearranging test-data.
* FileHandlerSpec: Adapted paths to changed test-data.
* TestStepSpec: Will be automated acceptance test. Started implementation with FeatureSpec style.