fix the way events are tracked in ga and move them to tag manager
remove unneccessary use of event variable
change tests to test dataLayer correctly and not test for signup
Change test spec to hit dataLayer[0] due to other dataLayer key/value pairs not existing in the test framework
formatting changes and clean up of action/label errors
Merge pull request #47 from gocardless/move-events-to-tag-manager

Move events to tag manager