Configure path to the resource

[marclr]

Hi!
I was using the library when I realized that I can't configure the path/resource to the socket.io. Now the variable SOCKET_IO_1 is fixed to /socket/1, but in some environments and projects it could be possible that the path to the socketio is something like /xxxx/socket/1. So I propose to add the option to configure it, I can make the PR