Fixed width support. #391

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etspaceman wants to merge 2 commits intodatabricks:masterfrom

medseek-engineering:master

Commits on Oct 27, 2016

Fixed width support. Adds Relation, LineReader and BulkReader traits to avoid duplicated code. Largely derived from https://github.com/quartethealth/spark-csv
Eric Meisel
committed
Fixed unit tests
Eric Meisel
committed