fixed bug were it would make multiple xhr requests #240
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found that with multiple subscribers to an observable it would re-emit the execution chain aka send xhr requests for every subscriber. We were using the share method however that only allows to multicast aka allow multiple subscribers but it would still follow the chain and make all the computations it is subscribed to. After reading the docs, the shareReplay method allows for the replaying of values that was returned from the observable without making a costly xhr request for any amount of subscribers.