updates
Merge branch 'brunch' of https://github.com/brunch/brunch.github.io into brunch

* 'brunch' of https://github.com/brunch/brunch.github.io:
  Add browser-sync-brunch plugin to the plugins list
  Add jsxhint-brunch plugin
  Update plugins.jade
  Add traceur-brunch plugin
  added brunch-with-pb to skeletons list
  Added Vegan brunch to list of skeletons