Upgraded guzzle4 to 4.1.6 in the framework tests

The passed tests changes from `93.01%` to `92.54%`.

Old stats:
    
    Tests: 660, Assertions: 1575, Failures: 3, Errors: 43, Skipped: 2.

New stats:

    Tests: 686, Assertions: 1628, Failures: 3, Errors: 48, Skipped: 2.

You can see the old and new error logs here: https://gist.github.com/GrahamCampbell/826d87c35e3049f683dc.