Addition of ISO Country Codes (Char and Num) to gapminder data objects#16

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jrebane wants to merge 3 commits intojennybc:masterfrom jrebane:master

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Commits on Oct 20, 2016

ISOC3 Values added for gapminder/gapminder_unfiltered
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Commits on Oct 21, 2016

Updated documentation and added raw data extraction methods
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Updated documentation further to reflect addition of two ISO variables
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