Return new Observables instead of using compose with Transformers

[kmdupr33]

Current use of transformers is incorrect, as I'm not actually returning the result of applying a bunch of operators to an upstream Observable. This can result in weird behavior/race conditions if schedulers are used in certain ways (e.g., if the upstream observable emits on a background thread while the outer observable emits on the main thread). Since my current use doesn't fit the compose transformer contract, I probably shouldn't use it.

[kmdupr33]

I'm actually not 100% sure that this is true.