Fix rendering bug in the orderer

Summary:
Check out the initial revision of
https://www.khanacademy.org/devadmin/content/items/x6d0779e11201d611
Note the ugliness.

Test Plan:
 * make an orderer
 * set the scale to 0.05
 * set the max y to 0.5
 * verify that there are no really long numbers

Auditors: alex