Added "scrollThen" that can apply a scroll animation before another transition
Added "scrollThen" that can apply a scroll animation before another transition

Related to issue #76

Usage:

  this.transition(
    this.fromRoute('posts'),
    this.toRoute('post'),
    this.use('scrollThen', 'toLeft'),
    this.reverse('scrollThen', 'toRight', {duration: 100})
  );

knownasilya/liquid-fire,kategengler/liquid-fire,ianstarz/liquid-fire,byelipk/liquid-fire,totallymike/liquid-fire,csantero/liquid-fire,ef4/liquid-fire,gordonbisnor/liquid-fire,twokul/liquid-fire,acorncom/liquid-fire,runspired/liquid-fire,byelipk/liquid-fire,jayphelps/liquid-fire,topaxi/liquid-fire,mikegrassotti/liquid-fire,jayphelps/liquid-fire,mikegrassotti/liquid-fire,ember-animation/liquid-fire-velocity,envoy/liquid-fire,ember-animation/ember-animated,ember-animation/liquid-fire-core,givanse/liquid-fire,chadhietala/liquid-fire,davidgoli/liquid-fire,knownasilya/liquid-fire,davidgoli/liquid-fire,twokul/liquid-fire,chadhietala/liquid-fire,gordonbisnor/liquid-fire,jrjohnson/liquid-fire,monegraph/liquid-fire,jrjohnson/liquid-fire,acorncom/liquid-fire,topaxi/liquid-fire,runspired/liquid-fire,csantero/liquid-fire,davewasmer/liquid-fire,givanse/liquid-fire,monegraph/liquid-fire,totallymike/liquid-fire,ember-animation/liquid-fire-velocity,ramybenaroya/liquid-fire,ef4/liquid-fire,kategengler/liquid-fire,dsokolowski/liquid-fire,dsokolowski/liquid-fire,ember-animation/liquid-fire,ianstarz/liquid-fire,jamesreggio/liquid-fire,ember-animation/ember-animated,ember-animation/liquid-fire,ember-animation/liquid-fire-core,davewasmer/liquid-fire,ember-animation/ember-animated,jamesreggio/liquid-fire