feat($parse): Adds range operators

Adds the operators '..' and '...' that work as range operators. These new operators are only valid within an array declaration and allows the array to be declared as a range. E.g.

```html
<div ng-repeat="index in [1...pages.length]">{{index}}</div>
```

Note: Truth be told, I am not 100% happy with implementing ranges, but this PR opens the question if this should be implemented as I find ad-hoc implementation like #5268 hacky