Upgrade requirejs from 2.1.9 to 2.1.11

Fix #500, #501.

Version 2.1.11 uses a newer version of uglify2 which correctly translates logic for !== comparisons. 2.1.9 must have been using an outdated version because the minified output contained logic that was simply not correct when converting !== comparisons.

Signed-off-by: Don Naegely <naegelyd@gmail.com>