Move release notes (as versioning not required in directory). Added known issues page.
Removed redundant release notes folder.

TODO: Find a way to list release notes from all previous releases.
extend timeout for integration test (http latency detector)
Tweaked Workaround and Fix descriptions.
Merge pull request #606 from jdtoy/readme-knownissues

Docs: Move release notes, add known issues.
Merge branch 'master' into 0.5