fix(pivot): increased code coverage for Pivot
fix(pivot): increased code coverage for Pivot

Fixed low code coverage with tests by removing calls to `PivotItem` inside specs.

Closes #321

s-KaiNet/ng-officeuifabric,andikrueger/ng-officeuifabric,ngOfficeUIFabric/ng-officeuifabric,andikrueger/ng-officeuifabric,rolandoldengarm/ng-officeuifabric,jjczopek/ng-officeuifabric,ngOfficeUIFabric/ng-officeuifabric,ngOfficeUIFabric/ng-officeuifabric,rolandoldengarm/ng-officeuifabric,jjczopek/ng-officeuifabric,andikrueger/ng-officeuifabric,s-KaiNet/ng-officeuifabric,jjczopek/ng-officeuifabric,s-KaiNet/ng-officeuifabric,andrewconnell/ng-officeuifabric,ngOfficeUIFabric/ng-officeuifabric,jjczopek/ng-officeuifabric,andikrueger/ng-officeuifabric,s-KaiNet/ng-officeuifabric,rolandoldengarm/ng-officeuifabric,andrewconnell/ng-officeuifabric,andrewconnell/ng-officeuifabric,andrewconnell/ng-officeuifabric,jjczopek/ng-officeuifabric,andikrueger/ng-officeuifabric,andrewconnell/ng-officeuifabric,s-KaiNet/ng-officeuifabric,rolandoldengarm/ng-officeuifabric,rolandoldengarm/ng-officeuifabric,ngOfficeUIFabric/ng-officeuifabric