update styles
update buttons
Merge branch 'master' of https://github.com/nucleic/phosphor
wip Slider widget
update slider css
add batch update support to the base Widget
use batching support with the push button
wip
Merge branch 'feature-slider' of https://github.com/nucleic/phosphor into feature-slider

Conflicts:
	src/styles/slider.css
	src/widgets/slider.js