Change required angular version

The ovbious first step
Add compabitility for angular 1.3

The way the link and controller function work was changed in angular 1.3
(last entry of this section
https://github.com/angular/angular.js/blob/master/CHANGELOG.md#since-1217-and-130-beta10).
Luckily this is still lets us support angular 1.2 for as long as we have
to