chore(demo): add basic GA tracker code
chore(demo): add basic GA tracker code

Closes #282

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