Update trend x-axis selector

* Selector regex looks for whitespace or comma
* Fixes the x-axis positioning in IE
* Fixes cascading errors that caused the table not to load

Error:
![ie-error](https://cloud.githubusercontent.com/assets/5265058/4362305/cd02d722-428b-11e4-8971-ba98115dc5b8.png)

@rocha @clintonb