verifying the signature using connect.nkey configuration

thanks @smsteel fixing #38 in #54

subscription handler fix

0.15.1

Update Consumer.php

optional consumer ack

0.15.0

Update Client.php

optional info xkey message property

thanks @nikola-primeinsights see #47

keep message processing on server ping request

@oxidmod via #43

fix logger messages for payload reading process

@oxidmod via #42

client read timeout check on empty socket line

thanks #41 by @oxidmod

delivery policy option configuration

#40 by @oxidmod

parse jet stream message timestamp

#39 by @oxidmod

ephemeral consumers

thanks @oxidmod