HttpTransport implementation (#6)

i took a first stab at #6, doc-blocks and especially tests are yet missing but will be completed - i'd be first interested in some feedback from @bzikarsky? :) 

Is that - at least a bit - like you'd thought it should? `HttpTransport` is mainly based on `UdpTransport`.. i'm open to suggestions, if we should make it more flexible at certain points?
erm, yeah that is indeed random - the assumption simply was that 1024 should be large enough to read whatever headers might be contained in the response .. will change that :)