Notes-server assumes the presentation is at index.html

[p3palazzo]

Expected behavior: The notes-server opens the presenter screen to the filename of the slideshow that is running

Actual behavior: The notes-server always assumes the slideshow file is ./index.html

Result: The presenter's screen tries to load index.html, which is not a reveal.js slideshow. Note that in this case the master is still able to send commands to the socket.io server by using the main slideshow screen, but changing slides through the presenter's notes screen does not work.

[sashokbg]

Hey @p3palazzo I just opened a PR that addresses this issue. Please feel free to take a look at it and put your comments while we wait for the project's maintainer to take a look

#4