Clarify the meaning of the notes?: regex

Fix timer when speaker notes window opened via RevealNotes.open()

Adding support for hash linked slideNumber

* Print background in pdf

Pull request to integrate issue https://github.com/hakimel/reveal.js/issues/1686. Adding the workaround to the theme template to make it work for every theme.

* apply suggestion of @hakimel

Cleanup readme to make it easier to read/edit.

Prefer W3C pointer events and updates to match the standard definition

Updates copyright to 2018

* add support for overriding the default layout
New `overrideLayout` option (if true) will prevent h/w calcs.

* fix error if options are empty

* Implement requested changes
Rename overrideLayout to disableLayout and remove code to unset display