Falsy Data Quicktests

Please comment on:

more cases that could to be added
code quality
style
the way Im doing things
should this be in the 2up?
etc.

Currently these quicktests render null, NaN, undefined, false, and empty string data on linear, ordinal, and time scales. Data rendered all go from (type,type) -> (type, 1) -> (1, type) -> (2,2). 
ex. {null,null}, {null, 1}, {1, null}, {2,2}

thanks peeps

screenshots here:

![screen shot 2014-10-03 at 11 21 18 am](https://cloud.githubusercontent.com/assets/8551049/4510421/485b75d6-4b2a-11e4-917c-0939bf407d10.png)
![screen shot 2014-10-03 at 11 21 31 am](https://cloud.githubusercontent.com/assets/8551049/4510419/4859fba2-4b2a-11e4-95d2-37eaf2c0171b.png)
![screen shot 2014-10-03 at 11 21 46 am](https://cloud.githubusercontent.com/assets/8551049/4510420/485a971a-4b2a-11e4-95f0-0381238b9658.png)
![screen shot 2014-10-03 at 11 22 18 am](https://cloud.githubusercontent.com/assets/8551049/4510422/485d750c-4b2a-11e4-9bb3-d298708e939a.png)