chore(travis): unit-test latest & latest-1 Chrome, FF, Edge

Previously, we used fixed versions that became outdated quickly for
FF and Chrome.

Safari 10/11 is not included because during the latest test there were 
failures, see https://github.com/angular/angular.js/pull/15717

Jasmine is fixed to 2.5.2 because 2.6.0+ is not compatible with the suite:
https://github.com/angular/angular.js/pull/15927#issuecomment-309206419

Closes #15927