Adding @gvwilson's original lesson from#25

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ChristinaLK wants to merge 4 commits intocarpentries-incubator:gh-pagesfrom ChristinaLK:job-control

+364-1

Commits on Jun 23, 2015

Adding @gvwilson 's original lesson from
ChristinaLK
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Commits on Jul 15, 2015