removed ruby dependency.
Update package.json
update highlight.js to 8.1
only load highlight.js if there's a 'pre code' block on page
the paused mode can now be disabled via the 'pause' config option
fix previewLinks target
fix current fragment index check when multiple fragments have same index
better test for fragment indices
util methods for calculating color brightness
add is-background-light class to slides/backgrounds that are > 128 brightness
use computed style when calculating bg birghtness
update slide backgrounds example
is-light-background -> has-light-background, doesn't apply to background itself
bubble has-light-background to .reveal container
has-dark-background
rgba color parsing support, ignore brightness of transparent colors
cleanup classes when backgrounds are synced
update highlight.js to 8.2
dont open notes when S is pressed inside of notes window #991
add new black theme