title: What is difference beetween layout:'hbox' and layout:'column'
body: <p>What is difference beetween <code>layout:'hbox'</code> and <code>layout:'column'</code>? Is it only syntax?</p>
  
  <p>Example '<strong>column</strong>':</p>
  
  <pre><code>layout:'column',
  items: [{
      title: 'Width = 25%',
      columnWidth: .25,
      html: 'Content'
  },{
      title: 'Width = 75%',
      columnWidth: .75,
      html: 'Content'
  },{
      title: 'Width = 250px',
      width: 250,
      html: 'Content'
  }]
  </code></pre>
  
  <p>Example '<strong>hbox</strong>':</p>
  
  <pre><code>layout: {
      type: 'hbox',
      pack: 'start',
      align: 'stretch'
  },
  items: [
      {html:'panel 1', flex:1},
      {html:'panel 2', width:150},
      {html:'panel 3', flex:2}
  ]
  </code></pre>