Update gaia-ui-tests.json; Merge pull request #1364 from bebef1987/pep8

PEP8 review
Merge branch 'master' of github.com:mozilla-b2g/gaia
Merge branch 'master' of github.com:mozilla-b2g/gaia
Merge branch 'master' of github.com:mozilla-b2g/gaia
Update gaia-ui-tests.json; Merge pull request #1366 from zacc/rename_actions_activities

Rename the Actions class to Activities to represent the correct nomencla...