* Properly reset requests in getSDK

We test for 'requests[url]' which is true for an
empty array, so reset it to null after a failed
fetch.

* Activate getSDK tests, don't run them concurrently

As we use shared global variables in getSDK
the tests can't be run concurrently, which
is the default for AVA.

* Add a test for SDK fetch after failed fetch

* PIP support for Safari

* Move inside block

* Check for mobile safari
Mobile safari "supports" PiP, however does not function

* Add another check for current mode

controls property for twitch player must be true if url is for a channel. Otherwise, video will not load in iframe.

Fixes #730

Fixes #728

Fixes #732