Addition of Travis

We just landed support for form factor which means that the submission flow (step 2) looks different.

Update test_that_checks_required_field_validations_on_device_types_for_hosted_apps to check for form factor message
Change selected form factor in MockApplication to a single one
Fix typos and pep8 issues

Xfail tests that are failing because of Bug 969242

Unxfail test_that_a_screenshot_can_be_added as the issue is not reproducible anymore

credentials

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action_chains