A lot of improvements on the AngularJS branch

1. upgrade angular version to 1.5.8
2. upgrade bootstrap to 3
3. fix ui integrations up to visits
4. move to webjars

Still need to fix an issue for Joda Time to work together with AngularJS

Realised that @ModelAttribute annotated methods are not suitable
because they can’t be used in 2 cases:
- when I’m using a list of Owners
- when I’m creating a new Owner

So we’re just calling the “retrieveOwner” method manually

This article explains well why ui-router now is more popular:
http://www.funnyant.com/angularjs-ui-router/