add test for join/leave channel system messages
add test for join/leave channel system messages

kerphi/phpfreechat,jahanzaibbahadur/phpfreechat,jahanzaibbahadur/phpfreechat,bright-sparks/phpfreechat,MingJen/phpfreechat,bright-sparks/phpfreechat,jahanzaibbahadur/phpfreechat,MingJen/phpfreechat,MingJen/phpfreechat,kerphi/phpfreechat,bright-sparks/phpfreechat