Back patching mono support by including their new concurrent queue impl locally,

This solves the concurrency issues for Akka.NET on earlier versions of Mono.
Merge pull request #307 from rogeralsing/dev

Back patching Mono support for earlier versions of Mono
Implement RemoteWatcher
Merge pull request #313 from smalldave/akka-remote

Implement RemoteWatcher
changed backoff-interval for #309
Merge branch 'dev' into remoting-fixes
added DeadlineFailureDetector and set it to default, per #308
made heartbeat fixes to ProtocolStateActor per #308
Add preliminary build support on Mono for #62.
updated configuration to make DeadlineFailureDetector default for AkkaProtocolTransport #308
Merge pull request #306 from mattnischan/mono-build

Add preliminary build support on Mono for #62.
fixed a critical FSM bug per issue #309
upgraded Helios dependency to v1.3.5
Merge pull request #317 from Aaronontheweb/remoting-fixes

Akka.Remote fixes - Resolves #309
Add TailChopping router and spec for #295, as well as AtomicInteger fixes required by the router.
Merge pull request #321 from mattnischan/tailchoppingrouter

Add TailChopping router and spec for #295, as well as AtomicInteger fixes required by the router.
Add Beta paragraph to Readme.md