Fix sl-ember components endpoint

git@github(ssh) urls requires the user to have a github account with ssh keys. bower will default to git://github.com when using this shorthand and that will work in most situations.

p.s.
git@github.com vs https:// vs git://github.com
git://github.com by using shorthand appears the way most packages implement this.
Merge pull request #90 from jschaftenaar/patch-2

Fix sl-ember components endpoint