Get rid of the pubnub warning message and set the default origin to "pub...

<h2>ABSTRACT:</h2>

Get rid of the pubnub warning message and set the default origin to "pubsub.pubnub.com".
See also: <https://help.pubnub.com/entries/21403311-How-Do-I-Use-a-Custom-Origin->.

<h2>REVIEWER(S):</h2>

@larsxschneider 

<h2>TESTING:</h2>

Manual testing.

I really do not want to mix _DEBUG and _RELEASE. IMO - we could drop this change because this warning is only shown in the console which the users do not see it in the release mode.