Fixes typo that makes makeTable crash

I was trying out the examples, but makeTable didn't work. Figured out that there was a typo in the latest version of sheetsee.js (May 25). When I tried out the previous version, it worked. [Screenshot with some info](http://i.imgur.com/NHTnASl.png).

ps: sorry about that first pull that I closed
pps: loving sheetsee, hope to contribute an example soon