update to ember 1.3

Change-Id: I65b5520db5bd16bf7149e914b2119c11e283dfc1
Reviewed-on: https://gerrit.instructure.com/28159
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Aaron Shafovaloff <ashafovaloff@instructure.com>
Product-Review: Stanley Stuart <stanley@instructure.com>
QA-Review: Stanley Stuart <stanley@instructure.com>