Behavior improvements: when leaving a room, a pop up ask if the user really want to quit. And the current tab stay active when a none active tab is removed.
Behavior improvements: when leaving a room, a pop up ask if the user really want to quit. And the current tab stay active when a none active tab is removed.

git-svn-id: 14496471c1e7f47aed4ccd4e743787d9efef7a8c@540 2772adf2-ac07-0410-9d30-e29d8120292e

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