math probs extra text fix

removed the extra text from math probs
fixed issue with extra scroll wheels

Fixed issue where extra scroll wheels would appear on smaller screens
changes for render graph size
Changes for new node placement

Places new nodes in top left corner when made with the create node
button
Merge branch 'master' into dillanbutler
Removed redundancy and fixed bug 2416

Fixed bug 2416, multiple scroll bars popping up for different sizes and
also removed the redundancy of render graph and renderable,
rendertable.js is no longer needed
Fixed bug 2536

Fixed typo that made lessons learned button not work
Emergency fix to test mode.
Fixing a bug in description text for problem 7 of ps 3.
growth of terrorism bug
Merge branch 'master' of https://github.com/bvds/LaitsV3
Merge branch 'dillanbutler'
Fixed a bug where an unnecessary node was not marked as extra.
EB3 fix
Rounding decimals to 3 places for the graph to render properly
Adding the hint slides for ps-04 problems
Changing the image extension for the hint slides
removing the typo in the images name
problem 2 set 4 bug from document
Hacked together a new leaderboard.  Doesn't affect existing dashboard code.  Can be disposed after experiment is over.