improve description about installation and usage.
Merge pull request #441 from mcka1n/master

improve description about installation and usage.
Change a port number in the specs to avoid a potential conflict
Merge pull request #472 from petergoldstein/bugfix/port_conflict

Change a port number in the specs to avoid a potential conflict
fixed the sasl_authentication error
Merge pull request #477 from flypiggy/master

fixed the sasl_authentication error