Merge pull request #29 from hakimel/dev

fix double-navigation on touch for some android systems
removed all vendor-prefixes from reveal.css
added newly generated reveal.min.css
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re-created unprefixed version of reveal.css automatically using autoprefixer, to facilitate merging of changes to it
merged dev branch
reveal.css is now scss, merge autoprexier #1007
reduce grunt task overhead
add support for iframe backgrounds
Fix RTL Navigation with space bar
Merge pull request #30 from hakimel/dev

Dev
use nesting for fragment styles
update grunt-qunit
better handling of overflowing speaker notes #1017
continue auto-sliding through fragments on last slide #974
correct defaults for min-height, thanks @sebastianz #985
update grunt connect for more hostname flexibility #981
remove styles from #1030, simplify navigatePrev
fix navigatePrev in rtl mode #1030
Merge branch 'feature/background-iframe' of https://github.com/lutangar/reveal.js into dev