New examples: AngularUI Directives as Custom Templates

[AngularUI](http://angular-ui.github.io/) Directives are interesting use-cases for custom templates. I am particularly interested in the following:
- [~~UI Select~~](https://github.com/angular-ui/ui-select) - http://angular-formly.com/#/example/integrations/ui-select
- [~~UI Grid~~](https://github.com/angular-ui/ng-grid) - http://angular-formly.com/#/example/integrations/ui-grid

[UI Bootstrap](http://angular-ui.github.io/bootstrap/):
- [~~DatePicker~~](http://angular-ui.github.io/bootstrap/#/datepicker) - http://angular-formly.com/#/example/integrations/ui-datepicker
- [~~TimePicker~~](http://angular-ui.github.io/bootstrap/#/timepicker) - http://angular-formly.com/#/example/integrations/ui-timepicker
- DateTimePicker
- [~~Typeahead~~](http://angular-ui.github.io/bootstrap/#/typeahead) - http://angular-formly.com/#/example/integrations/ui-bootstrap-typeahead
- Related issue: https://github.com/formly-js/angular-formly/issues/59

**_Update**_:_Angular 1.4 is still not officially supported by [AngularUI Bootstrap](https://github.com/angular-ui/bootstrap/issues/3633#issuecomment-106842753), but since it's an ngAnimate issue (Modal/Carousel) I don't expect much trouble_