Added Guzzle Streams To The Framework Tests

Replaces #3383. The streams repo is an integral part of guzzle 4 so we should test it.

Note that there is currently one failing test:
```
1) GuzzleHttp\Tests\Stream\AppendStreamTest::testCanReadFromMultipleStreams

RUN TEST FILE:  cd /root/hhvm/hphp/test/frameworks/framework_downloads/guzzle-streams && /root/hhvm/hphp/test/frameworks/../../hhvm/hhvm -v Repo.Local.Mode=-- -v Repo.Central.Path=/tmp/framework-teste78LeR --config /root/hhvm/hphp/test/frameworks/php.ini -c /root/hhvm/hphp/test/frameworks/.generated.php.ini /root/hhvm/hphp/test/frameworks/vendor/bin/phpunit --debug  -c /root/hhvm/hphp/test/frameworks/framework_downloads/guzzle-streams/phpunit.xml.dist --filter 'GuzzleHttp\\Tests\\Stream\\AppendStreamTest::testCanReadFromMultipleStreams'

Failed asserting that false is true.

/root/hhvm/hphp/test/frameworks/framework_downloads/guzzle-streams/tests/AppendStreamTest.php:116
/root/hhvm/hphp/test/frameworks/vendor/phpunit/phpunit/src/TextUI/Command.php:179
/root/hhvm/hphp/test/frameworks/vendor/phpunit/phpunit/src/TextUI/Command.php:132
```