Add title prop to ActionBar

[bellacorbo]

Now the ActionBar needs to receive the title prop for title display:

<ActionBar title={this.props.title} onSave={this.handleSave.bind(this)}/>

@BrenoC

[klzns]

Wait until this get merged:
https://github.com/vtex-apps/storefront-editor/pull/42

[bellacorbo]

👍