Event sources should be decoupled from actions

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Expected Behavior

Any EventSource should only have to know about a single service with a single interface. They should not be expected to understand the quirks of each particular action nor need to wait for an action to succeed/fail.

Actual Behavior

Our current demo wires GitHub events directly to Elafros routes

Steps to Reproduce the Problem

Follow the GitHub demo

Additional Info

This is a back-filed issue for #40

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Fixed in branch v0.1 with #40