Setup OSX CI

[IgorMinar]

we should extend our .travis.yaml to run our tests on both linux (current) and osx.

https://docs.travis-ci.com/user/multi-os/

Once setup we should use it to run end-to-end test suite: #90

[cironunes]

https://docs.travis-ci.com/user/osx-ci-environment/

[jkuri]

I created a PR for this one, tests now passing with osx and linux configuration.
PR: #133

[filipesilva]

I believe this issue was closed via #151, but if not feel free to reopen the issue.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}