refactor(breadcrumbs): remove superfluous content projection
refactor(breadcrumbs): remove superfluous content projection

Closes #310

ppolyzos/ng-lightning,esarbanis/ng-lightning,ppolyzos/ng-lightning,ihym/ng-lightning,ng-lightning/ng-lightning,ihym/ng-lightning,ppolyzos/ng-lightning,ihym/ng-lightning,esarbanis/ng-lightning,esarbanis/ng-lightning,ng-lightning/ng-lightning