Add initial e2e tests

[katcipis]

We have our basic end to end test comparing the result of "console.log(666)" from v8 to abad =)

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@968856d). Click here to learn what that means.
The diff coverage is 1.04%.

@@            Coverage Diff            @@
##             master      #19   +/-   ##
=========================================
  Coverage          ?   49.77%           
=========================================
  Files             ?       23           
  Lines             ?     1531           
  Branches          ?        0           
=========================================
  Hits              ?      762           
  Misses            ?      716           
  Partials          ?       53

Impacted Files	Coverage Δ
tests/fixture/fixture.go	0% <0%> (ø)
cmd/abad/main.go	0% <0%> (ø)
abad.go	52.84% <100%> (ø)

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[ryukinix]

The way that tool works for testing it's neat. I'm just wondering why the travis is failing here:

docker: Error response from daemon: pull access denied for neowaylabs/abadev, repository does not exist or may require 'docker login'.

May you need add credentials in the setup for pre-built pull to dockerhub?

[katcipis]

@ryukinix It is because I'm still uploading the image here =(. It is more than 4GB to upload (YES THE WEB !!).