fix(world-clock): use $interval and stop it on $scope.$destroy

fixes memory leak and make world-clock e2e testable

SD-1035
chore(bower): update deps

- angular 1.3.2
- moment-timezone 0.2.4
Merge pull request #530 from petrjasek/devel

fix(world-clock): use $interval and stop it on $scope.$destroy