Moved things from 0.6.5 to 0.7 release notes.

The ones in 0.6.5 were ment to be used in the release-notes for vNext
Add a new 0.7.1 entry in RELEASE_NOTES

This is a placeholder for next version. It might not be 0.7.1. This will enable us to add to RELEASE_NOTES during development.
Merge pull request #484 from Aaronontheweb/dev

changed build.fsx to add Akka.Remote NuGet dependency to Akka.Cluster
Merge pull request #487 from HCanber/fix-releasenotes

Fix releasenotes