Update testing version of sprockets 3.x
Update testing version of sprockets 3.x

3 should means 3.x, not 3.0.x.

maschwenk/ember-rails,emberjs/ember-rails,tricknotes/ember-rails,emberjs/ember-rails,maschwenk/ember-rails,emberjs/ember-rails,tricknotes/ember-rails,maschwenk/ember-rails,tricknotes/ember-rails