Initial commit
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Replaced "workbook" with "worksheet" where appropriate.

It's my understanding that for Excel, workbook is the same thing as a file - which can contain multiple worksheets.
Merge pull request #1 from mmparker/master

Replaced "workbook" with "worksheet" where appropriate.
Fixed typos, added links
Merge pull request #3 from lcolladotor/master

Fixed typos, added links
added section on encoding information with formatting instead of text (bad!!)
update NR contribution.
Merge pull request #5 from nickreich/master

Added section on proper encoding of variables in Excel.
Update README.md

typo
Fixed links ending in )
Merge pull request #7 from jimktrains/master

Fixed links ending in )