Update stream.js - Bugfix

https://bugzilla.mozilla.org/show_bug.cgi?id=956328
https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/NsIRequest#isPending%28%29

Prevent NS_ERROR_UNEXPECTED exception from being thrown if the nsIRequest instance isn't paused when the resume method is called.
Bug 1111117 - Enable the private-browsing test add-on in the travis test suite
Bug 1112772 - Travis logs do not include verbose jpm logs a=me
Merge pull request #1758 from erikvold/1112772

Bug 1112772 - Travis logs do not include verbose jpm logs a=me
Merge pull request #1339 from DecipherCode/master

Bug 956328 Stream.resume triggers a resume on an unpaused stream pump r=@gozala
Merge pull request #1755 from erikvold/1111117

Bug 1111117 - Enable the private-browsing test add-on in the travis test suite a=me