v2.1.0

• Add ability to iterate over an array of the step names, like so:

  {{#step-manager as |w|}}
    {{#each w.steps as |step|}}
      <button {{action w.transition-to step}}>
        Go to {{step}}
      </button>
    {{/each}}
  
    {{#w.step name='a'}}
      <h3>Step A</h3>
    {{/w.step}}
  
    {{#w.step name='b'}}
      <h3>Step B</h3>
    {{/w.step}}
  
    {{#w.step name='c'}}
      <h3>Step C</h3>
    {{/w.step}}
  {{/step-manager}}