Expose socketio reconnect method on socketFactory

[JamesHenry]

Hey @btford,

In my current project, I need to be able to offer the user the chance to manually attempt a socket reconnect after the automatic polling has failed.

Exposing the reconnect method on underlying io Manager object seems to be the best way to do that, but please let me know if you feel there is a better option.

Best regards,

James

[LoganElliott]

@btford Any chance this will be merged in as I'm having the same problem.