Merge pull request #21 from btbonval/master

Dynamically find and handle raw dataset property names.
Replaced horribly inefficient animation code with a much better version using tween.js
Added error messages for mathBox eval
Reordered some calls to fix order issue and restructured some sections to make them more readable and resilient
Cleaned up census code
Added basic support for aggregate functions
Replaced old help content with accordion control and added math help
Re-wrote control bar to make it more usable and pretty
Fixed small issue with scrolling
Made mathBox go full-width when selected and widened it's base width
Made mathBox layout static again
generalizing math function finder