yandex: port to new api, make readyOnLoad
userfox: port to new test api
Merge pull request #256 from segmentio/test/userfox

userfox: port to new test api
quantcast: port tests to new api
quantcast: remove old test
yandex: remove tick
Merge branch 'test/yandex'
Merge branch 'test/quantcast'
rollbar: port to new test api
Merge pull request #262 from segmentio/test/rollbar

rollbar: port to new test api
why am i so stupid
Merge branch 'master' of ssh://github.com/segmentio/analytics.js-integrations
optimizely: port tests to new api
Merge pull request #263 from segmentio/test/optimizely

optimizely: port tests to new api
foxmetrics: port tests to new api, fix page(category)
usercycle: port tests to new api
preact: port tests to new api
piwik: port tests to new api
qualaroo: port tests to new api
intercom: port tests to new api