Fixing typo
Fix a typo (traivs -> travis).
Fixing typo.
Fix typo
Fix typo: "extdata" name was missing a "t"
Merge pull request #21 from aaronwolen/master

Fixed a few minor typos in intro.rmd and r.rmd
Merge pull request #20 from stephen-frank/patch-2

Fix typo: "extdata" name was missing a "t"
Merge pull request #19 from stephen-frank/patch-1

Fix typo
Merge pull request #18 from scharne/patch-1

Fixing typo.
Merge pull request #17 from craigcitro/patch-1

Fix a typo (traivs -> travis).
Merge pull request #16 from adrtod/patch-1

Fixing typo