cname to map subdomain.domain1.com to http://ift.tt/1rmGL67

I am looking for a way to

use a cname or whatnot to map

subdomain.domain1.com

to

http://ift.tt/1rmGL67

is this possible and what is the best way to do it?

more specifically, I have a github.io page at

http://ift.tt/1SlFhzk

and I own a GoDaddy domain at

collide.io

so I want to send

suman.collide.io

to

http://ift.tt/1SlFhzk