title: Options beginAtZero doesn't work in angular-chart.js
body: <p>I use angular-chart.js and chart.js 2.0.2 - I have bar char. It is my code for chart in index.slim</p>
  
  <pre><code>canvas#bar.chart.chart-bar chart-data="data" chart-labels="labels" chart-options="options"
  </code></pre>
  
  <p>How Can I set beginAtZero options (other options works (f.e display: true )) in my controller I tried:</p>
  
  <pre><code>$scope.options = {
      scale: {
        ticks: {
          beginAtZero: true
        }
      }
    };
  </code></pre>
  
  <p>What I did wrong?</p>