#5 Provide a filter mechanism for the CSV object parsing

[Anupam Sengupta]

Provide a mechanism to apply filters (as QBE?) to the CSV stream,
so that *only* matching CSV records are actually parsed into the
POJOs, and any non-matches are skipped/ignored.

This will address some of the "query" based needs. Initial focus can
be on functionality rather than performance.

[Anupam Sengupta]

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QBE can be complemented by a call-back approach with the (user defined)
callbacks providing a veto mechanism on the candidate parsed Objects.

Even the QBE can actually be implemented this way.

Would it be easier to provide a candidate Object (cleaner design) or direct
access to the underlying CSV fields (better performance)