* Add support for custom notes.html file

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?

* Fixed last header having a border-bottom 

`<tbody/>` is automatically inserted, so we can guarantee that this affects all ths and tds in the last row of the table *body* and the head is left untouched

* Gruntfile.js: watch tasks restructured

* add option to mute background videos

* bug fix - when the first section has a background-video, the vido do not execute. Now, it's work

* improvement on spaces and indentation

* Improvement of code. Now none flag is used, but the readyState property  from video element

* UPDATED - Improvement of code. Now none flag is used, but the readyState property  from video element

* UPDATED - Improvement on spaces and indentation

* UPDATED - Improvement on spaces and indentation

* format note content when creating slide

In html content, marked allow `Inline-Level Grammar` but not `Block-Level Grammar`, so when I write following:
```
note:
* a
* b
* c
```
it become:
```html
<p><em> a
</em> b</p>
<ul>
<li>c</li>
</ul>
```
unbelievable!

* fixed loading

* Add autoSlideRight option

When the autoSlideRight config option is active, the auto-sliding
will always navigate to the right and never down even if slides are
present there. This allows hidden "bonus slides" in presentations
which can be displayed as needed but won't show up automatically.

* Add a more flexible autoSlideMethod option

Auto-sliding will now use the method specified in the config if it is
a function or default to navigateNext.

* Fix build error

* add autoSlideMethod to default config

* 2x playback controls for retina displays

* tweak

* Added 4 fragment transitions effect.

* Clean version of the new transitions.

* add option to mute background videos (updated)

* update to highlight.js 9.0.0

* expose version number through  hakimel#1451

* add new fragment styles to readme hakimel#1445

* center help overlay with flexbox

* tweaked fragment examples

* include speaker view keyboard shortcut when applicable hakimel#1466

* rebuild css

* same code format

* fix broken iframe in backgrounds example

* code format

* Change ".video" to ".reveal .video"

I don't know if this is supposed to be this way ?

* use css  to scale slides up in safari

* Remove unused dependencies.

* Fix query parameter issue in notes plugin.

Closes hakimel#1392.

* Make PDF export section less OS X specific.

Closes hakimel#1073.

* fix notes regex hakimel#1522 hakimel#1392

* notes plugin no longer syncs overview mode hakimel#1446

* server notes plugin no longer syncs overview mode hakimel#1446

* update headjs to v1.0.3

* add 'shuffle' config value and API method hakimel#1506 hakimel#1089

* new empty template at index.html, move old index to demo.html hakimel#1526

* remove unintentionally added file

* minor tweaks

* Table of contents added in README.md

* generalize scroll offset prevention

* Update README.md

readme tweaks

* Update README.md

* support for standalone multiplexing

* remove test content

* new multiplex server courtesy of now.sh (closes hakimel#1377)

* Fixes hakimel#1549, now UA match is limiting out MS Edge and Chrome detection is improved. Also improved UserAgent access by storing it in to a local variable, it was accessed so many times in different places.

* Fix watching for markdown files

`./*.md` didn't work `*.md` does work

* lazy load iframe in demo

* widen watch for html files, required for updates to demo.html

* overview now works with percentage based width/height hakimel#1247

* readme tweak for hakimel#1535

* change introduction

* 3.3.0

* Simplify full setup

* Update README.md

more in-depth documentation of slide backgrounds hakimel#1542