Fixed MongoDB retained messages

[ldstein]

This PR addresses:

• Issue Mongo persistence - multiple retained messages being received on subscribe #74 (Mongo persistence - multiple retained messages being received on subscribe).
• Additional retained message unit tests included.

There are also some additional changes to get Mosca building, running and passing all unit tests on Windows:

• Bumped Microtime to 0.5.0 for Windows compatibility
• Moved Async_bench to optional depencies (can't build on Windows)
• Fixed "AfterEach" bug when running Unit tests on Windows
• SIGHUP unit test ignored when OS is Windows based.

[ldstein]

Damn you Travis :) I'll close this and check again what's going on.

[mcollina]

This is huge! Thanks! I'll review this in the next few days!

[mcollina]

Leave it open! I'll have a look too.. it might be a spurious failure coming up.

[ldstein]

The AfterEach bug is occuring in mosca/lib/client.js. See ldstein@3d85359

There is an end event listener added to connection.stream. If the stream is destroyed/being destroyed, the event never fires, hence the timeout. I added a check to see if the stream is destroyed - though I don't think destroyed is a consistent property on a Stream Object.

Good new is it's working on Windows. Bad news is it's failing on Linux, lol.

I'll do some more digging. The MongoDB / Windows stuff is working though.

[ldstein]

Happy to report Mosca unit tests now pass on both Linux and Windows

[mcollina]

Thanks again!