looping through images
hiding if there are no images
li
ng-clickk
panels - init
panels - showing based on click on tabs
ng-init
ng-class (highliting active tab)
ng-class
moving logic to controller - ng-init
moving logic to controlle - ng-click
moving logic to controller - ng-class
challenge init
challenge complete
challenge complete
challenge 3 init
challenge 3.1
3.3. init
3.3 - using ng-model
3.4. - showind binded fields in preview