lib/form.js
function(context) {
      var _children = [];
      _children.push(React.DOM.i({className: 'icon ' + context.icon}));
      React.Children.forEach(context.children, function(child) {
        _children.push(child);
      });
      context.children = _children;
    }
function(context) {
      var _children = [];
      _children.push(React.DOM.i({className: 'icon ' + context.icon}));
      React.Children.forEach(context.children, function(child) {
        _children.push(child);
      });
      context.children = _children;
    }
apply an icon to a button