Merge pull request #494 from jonpither/rotate-no-connection

[Fix #493] Rotate nREPL connection handles no nREPL connection.
Update README.md for issue #474

Document workarounds for EOL issues on Microsoft Windows and note powershell.el conflict (issue #474).
Merge pull request #496 from jonpither/known-endpoints

Cider command uses known endpoints
Merge pull request #497 from scottdw/patch-1

Update README.md for issue #474
when + not == unless
Minor refactoring
Code style
Adding cider-change-buffers-designation.