Fixed issues causing intermittent knitr errors#147

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biffster wants to merge 3 commits intoDataScienceSpecialization:masterfrom biffster:master

+8,169-10,188

Commits on May 22, 2016

Fixed the initial chunk declarations
Michael Fierro
committed
Fix structure (e.g. YAML blocks), explicitly declare library(knitr)
Michael Fierro
committed
Fixed issues causing intermittent knitr errors
Michael Fierro
committed