Merge pull request #248 from Aaronontheweb/master

Akka.NET v0.6.2
Merge remote-tracking branch 'upstream/master' into dev
Merge remote-tracking branch 'upstream/dev' into dev
upgraded Helios dependency and bumped version to v0.6.3
added a wait mechansim for blocking main application thread until cluster shuts down
fixed a bug that caused fallback configurations to be dropped during ActorSystem start
Merge pull request #267 from Horusiath/dev

Spec tests for DeathWatchSpec
Refactoring hocon support
Merge pull request #261 from Aaronontheweb/dev

[Getting ready for v0.6.3] upgraded Helios and added method to block application thread until ActorSystem shutdown
Removing AsInstanceOf and Pattern.Match where it makes sense
Merge pull request #269 from rogeralsing/dev

HTML API Documentation
Delete Akka.chm
Remove TestKit's AtomicInteger and replace with Akka.Utils.AtomicCounter
Move Comparable from Testkit to Akka.Tests, to remove dep on fastJSON
Remove HoconTests from TestKit and duplicate in Akka.Tests
Move ImplicitSenderSpec to Akka.Testkit.Tests
Move Supervisor to Akka.Tests
Change namespace for AkkaSpec & TestProbe to Akka.TestKit
Implement TestKit.TestActor

Also fix tests since the AkkaSpec queue now contains MessageEnvelopes.
Move types in AkkaSpec.cs to matching files