Runtime csv field mappings#52

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imprahul wants to merge 2 commits intomperdeck:masterfrom

imprahul:master

Commits on Aug 8, 2016

Added code for supplying field name headings at runtime using a dictionary. This is still a naive implementation, and needs to be much more type safe in the future.
imprahul
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Added test code for the new runtime field mappings
imprahul
committed