Disallow use of angular functions

There are rules which enforce the use of AngularJS functions.

**Good**

``` js
angular.isUndefined(foo);
```

**Bad**

``` js
foo === undefined;
```

I think these should all have an opposite variant as well:

**Config**

``` yaml
rules:
angular/definedundefined:
- 2
- never
```

**Good**

``` js
foo === undefined;
```

**Bad**

``` js
angular.isUndefined(foo);
```

I figured the value of this extra property can be `always` or `never`, because this matches a lot of builtin ESLint rules.