Create a single fragment event per fragment-index

For backward-compatibility, add a new 'fragments' property to the
fragmentshown and fragmenthidden events. The 'fragment' property still
returns the first fragment.
Support for notes within markdown
default lineheight #512
Updated README.md

Added "touch" config property
Merge pull request #517 from punchFaceChamp/patch-2

Updated README.md
additional background test
Merge branch 'fix-notes-after-pr-435' of https://github.com/ericweikl/reveal.js
test > examples
add barebones example
update url to setup instructions (closes #520)
update changelog links
work around iframe flicker in 3d transitions
typo and whitespace correction
fix initial auto-slide overridev #525
readme update for #505
ensure all future fragments are invisible #473
Merge branch 'dev' of github.com:hakimel/reveal.js into dev
add immediate transition style (#528)
document 'none' background transition
multiplex readme tweaks #514