Closes #1392.

It would be nice if we could define a custom notes.html file.

Actually, I'm used to compile my js files before releasing my app and, using selectors like `script[src$="notes.js"]`, doesn't work :(

So, what do you think about it?

This prevents the upcoming slide on the notes page from triggering
slidechanged events.  I believe this fixes issue 578, as well.

Resolves an issue where the first label (e.g., first bullet or first
number) of a list would wrap to the right side of the window and be
hidden under the clock element.

show error when notes run on non-http, fix load order to make sure upcoming slide is correct when notes open (#278)

Its was impossible (at least for me) to keep the windows in sync without bloating the code too much.