Rob Wormald a88e6f3106 refactor(http): use Observables in Http backends
BREAKING CHANGE: Http now returns Rx Observables directly, so calling .toRx() is no longer necessary. Additionally, Http calls are now cold, so backend requests will not fire unless .subscribe() is called.

closes #4043 and closes #2974

Closes #4376
2015-09-27 22:15:30 +00:00
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