add theme 'blood.'
Add various configuration options to README

Also add a description about the solarized theme.
clone via https - ssh not working anonymously
Add details to README on creating themes.

Closes #662.
Merge pull request #664 from vertti/patch-1

add details to README on creating themes
Merge pull request #657 from asmaps/master

README: clone via https
readme tweak #660
merge readme conflict
Merge branch 'update-readme' of https://github.com/aethanyc/reveal.js into dev
additional config valeus in readme, remove duplicate value, fix commas
Merge branch 'dev' of https://github.com/Walther/reveal.js into dev
include all themes in grunt task
configure notes presentation through query string to avoid flicker
Add attributes in markdown for slide generation.

By default, look for <!-- slide-attributes: xxxx -->.
Whatever 'xxx' is will be added to the section attributes.

You can define your own pattern with 'data-attributes'.
For instance 'data-attributes="^\s*?-- (.*?)$"':
that will be added to the options.

The 'attributes' section is removed from the content of the slide,
so the final markdown doesn't reflect them.
That also means you can add those attributes *anywhere* in the slide

But that allows for *any* attribute to be added for a specifc slide,
like:

- id="plan", for allowing internal link (issue #430)
- data-background="#ff0000"
- data-transition="fade"

You list those attributes on a single line, like

- (default):
` <!-- id="plan" data-background="#ff0000" -->`
- or, with an alternative data-attributes pattern:
` -- id="plan" data-background="#ff0000"`

Again, that line is remove from the final content.
Fix bug on data attributes for first vertical slide.

The first slide of a vertical stack see some data attributes ignored.

Mainly the data-transition one.

Repeat all data-attributes on the wrapping section element.

Ignore any other attributes (like 'id="xxx"'), in order to not
mess with internal links (by repeating twice an id).
Make sure a pattern doesn't include space.
Fix markdown vertical wrapping section element generation.
Rebased on dev, and following contribution guideline.
Fix markdown.js slideAttributesSeparator selection.
Add QUnit.js unit tests for attributes in Markdown slides.