Implemented streaming in Transport/Stream.php

[alexbilbie]

Fixes #92

[jadell]

The streaming addition is okay, as long as you make the additions requested in #90.

A few comments about the rest of it:

• There is no need to use fopen/fread/fclose here. file_get_contents is basically a wrapper for doing exactly that.
• Also, setting and then unsetting an error handler on every request seems like it would be expensive. If you want to check if there was a problem connecting, check $response === false and manually throw the exception. If making a specific connection check in the transport layer is desired, it should also be done for the Transport\Curl connector.

Will you please revert the fread and the exception throwing changes, and make a separate pull request?

[alexbilbie]

Have opened #99 with aforementioned changes