Fixing typo

Is it actually published to rubygems.org so far? I had to rely on :

gem 'ember-bootstrap-rails', github: 'kristianmandrup/ember-bootstrap-rails'
Merge pull request #1 from ZenCocoon/patch-1

Fixing typo. Yeah, I will push it to rubygems as soon as I have confirmation that it is sufficiently nice and stable. Let me know of your experience and suggestions for improvements ;)