Add note that only first three R lessons are likely to be covered.
Add link to download inflammation data as a zip file.
Add back chunk_options.R file for use with novice R lessons.
Replace $ with ` to define code variables in text explanation of rescale
challenge.
Add hint that no return statement is necessary when a function is only
plotting data.
Remove numbering of challenges.
Put challenge to calculate total sum before challenge to calculate
exponentiation.
Update text to be consistent with example data.
Merge pull request #2 from jdblischak/novice-r-edits

Edits to novice R lessons to prepare for FMV workshop.