First application of http pipelining code
Re-instated the need to wait for a message event to complete, then checking whether the connection is still open before deciding to continue with the iteratee.
Changed the group/artifact/package to align with how we do things.
Re-factored some repository variable names in accordance with their usage.

Also added the typesafe snapshot repo into dependency resolution when we're building a snapshot release.
Further re-factoring of the repository declarations given my further understanding - and also to fix an issue where dependencies were not being resolved from a ivy2 layout (at least I think that was the issue).
Corrected repo names
Now using the 1.0.0 of the pipelining library.
Merge branch 'master' into http-pipelining
Merge pull request #945 from huntc/http-pipelining

Http pipelining support