Revert "First testable version"

This reverts commit 3fa182032af83b7f8f866695bf262515987e9e20.

Conflicts:

	lib/sendgrid_postback/event_receiver.rb
Cleaned up initialization defaults
Merge branch 'decomposed_events' into staging
Merge branch 'staging' of github.com:lukassfranklin/sendgrid_postback into staging