[atmosphere.js] Firefox/IE close tabs not detected

[jfarcand]

As reported here

chrome:
<tab opened>
onSuspend : 34ff3a41-1df5-4411-956c-8bfbae7d8210
<page reloaded>
onDisconnect : 34ff3a41-1df5-4411-956c-8bfbae7d8210
onSuspend : 2e38b9ac-9f37-42ef-9959-ef39f1602503
<tab closed>
onDisconnect : 2e38b9ac-9f37-42ef-9959-ef39f1602503

ie9:
<tab opened>
onSuspend : 04797760-4e05-4ba8-b269-58e9286a112d
onDisconnect : 04797760-4e05-4ba8-b269-58e9286a112d
<page reloaded>
onSuspend : 9d435f73-0e76-4f35-9497-1a3a759897f4
onDisconnect : 9d435f73-0e76-4f35-9497-1a3a759897f4
<tab closed>
nothing

firefox:
<tab opened>
onSuspend : fa2c8d27-ce11-4625-b3bf-f7dde6ba7b1a
<page reloaded>
onSuspend : 9ec69d4d-bd66-4c35-9737-8e84ff58a20a
<tab closed>
nothing
<application closed>
onDisconnect : fa2c8d27-ce11-4625-b3bf-f7dde6ba7b1a
onDisconnect : 9ec69d4d-bd66-4c35-9737-8e84ff58a20a

[jfarcand]

Fixed by

aa5a6ee

[flowersinthesand]

As I said before - https://github.com/Atmosphere/atmosphere/pull/466/files#L0R31, this change may get existing apps using beforeunload event confused.

It would be good to add new option for this change. In jquery-socket, I'll treat obstructive but useful workarounds like this by providing a static method - https://github.com/flowersinthesand/jquery-socket/issues/49

Finally, I'm not sure beforeunload event is solution for this. It seems that the problem depends a combination of browser, transport and server.