Show port along with project name in `nrepl-repl-buffer-name'
Add tests for new `port-in-nrepl-repl-buffer-name' functionality

- test-nrepl-clojure-buffer-name-based-on-port
- test-nrepl-clojure-buffer-name-based-on-project-and-port
- test-nrepl-clojure-buffer-name-duplicate-proj-port
Add documentation about displaying port name in nrepl-repl-buffer-name