Show attributes and values for SAMPLE columns

This adds an "uber column" of INFO, SAMPLE_1, ... SAMPLE_n
with respective attibutes/values uderneath them.

fixes #67
Does this give you a copy of the array in `this.state`, or a reference? It's not super important since you `setState()` at the end of this method, but I am curious if you can modify objects in state w/o React knowing.