docs(tutorial): Code samples use deprecated $http promise methods

[rabdill]

The tutorial (website, repo) looks like it might be due for at least a few minor changes. In particular, starting in step 5, it sets up a call using the $http service like this:

phonecatApp.controller('PhoneListCtrl', function ($scope, $http) {
  $http.get('phones/phones.json').success(function(data) {
    $scope.phones = data;
  });

  $scope.orderProp = 'age';
});

When, according to the most recent docs, we aren't supposed to do that anymore. I'd be happy to move everything into using the .then() method, but this would also require fixing the angular-phonecat repo that's used in the tutorial, and I'm not sure if there's a particular process in place for coordinating changes so they line up properly. (Also, to be honest, I have no idea how you've been dealing with pushing changes through all the phonecat "releases" retroactively without someone dying in a rebasing accident.)

[gkalpak]

Closed with c2033d7.