fix tests, add formaly optional csv parser params

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part of the public API of the
Aggregation class. It should no longer be called within render() but is
instead called outside.

This might potentially break plugins implementing their own
aggregations. Needs to be checked

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fixed tests and codesniffer complaints

fixed tests

clean up for the tests

This mostly corrects file and class names for PSR-2. Function names have
not been adjusted yet