refactor(firebase observable): use specific import paths for angular [ci skip]
refactor(firebase observable): use specific import paths for angular [ci skip]

rolandjitsu/ng2-lab,rolandjitsu/angular-lab,rolandjitsu/ng2-lab,rolandjitsu/ng2-play,rolandjitsu/angular-lab,rolandjitsu/angular-lab,rolandjitsu/ng2-play,rolandjitsu/ng2-play,rolandjitsu/ng2-lab,rolandjitsu/angular-lab,rolandjitsu/ng2-play,rolandjitsu/ng2-lab