Fixed a couple of typos and a broken hyperlink
Update R_Introductory_tutorial_2014.md

Fixed a few typos
minor typos
Update index.txt
Update index.txt
Update index.txt
Merge pull request #6 from standage/2014

Fixed small typo
Merge pull request #5 from willpitchers/patch-2

minor typos
Merge pull request #4 from ACharbonneau/patch-1

Update R_Introductory_tutorial_2014.md
Merge pull request #3 from willpitchers/patch-1

Fixed a couple of typos and a broken hyperlink
r data munging script + sample data
modifed R munging script
Added Daniel's presentation