Added auto-http-server-port command line option
- program option allowing hivemind to bind to first available port from selected range
- port is chosen from range defined in option i.e.:
--auto-http-server-port 1024 2048
- additionally port number is written to a hivemind.port file
- removed version.py from repo. gitignore now ignore this file as expected
- added hivemind.port file to gitignore