Quality: End-to-End tests

[armand1m]

As we already have our Acceptance Links from Netlify, and also Travis CI getting integrated, perhaps we could start running some End-to-End tests using BrowserStack for Perry.

We can apply for an Application Form in BrowserStack to run our e2e when needed https://www.browserstack.com/open-source

Even tho, this issue is here mainly to track the development of the end-to-end project and their use cases inside using WebDriver.io with Cucumber.

We should discuss in order to define the flows we want to test in regarding to perry, but I do believe is going to be quite simple since it's UI don't have many features yet.

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