Render the main overview page
function getStacks(req, res) {
    var data = {};
    async.auto({
      stacks: function(callback) {
        dreadnot.getStackSummaries(function(err, stacks) {
          data.stacks = stacks;
          callback(err);
        });
      },

      regions: ['stacks', function(callback) {
        async.forEach(data.stacks, function(stack, callback) {
          dreadnot.getRegionSummaries(stack.name, function(err, regions) {
            if (err) {
              callback(err);
              return;
            }

            stack.regions = regions;
            async.forEach(stack.regions, function(region, callback) {
              // TODO: Should this go in dreadnot.js or stack.js maybe?
              if (region.latest_deployment === '0') {
                region.latest_deployment = null;
                callback();
                return;
              }
              dreadnot.getDeploymentSummary(stack.name, region.name, region.latest_deployment, function(err, deployment) {
                region.latest_deployment = deployment;
                callback(err);
              });
            }, callback);
          });
        }, callback);
      }],
    }, function(err) {
      renderCallback(req, res, 'stacks.jade')(err, data);
    });
  }