Fixed issue #150

  * Made a 1px border the color of the background for each shade
  * Fixed the .light and .dark duplication in CSS
Fixed that damn charset on CSS
Removed unrequired uses of stopImmediatePropagation
Rebuilt gumby.min.js with Claymate
Bumped Bower version and remove debug from ui.html
Merge branch '150-labels-alignment' of github.com:izeau/Gumby into izeau-150-labels-alignment
Merge branch 'izeau-150-labels-alignment' into hotfix/2.5.11
Merge branch 'hotfix/2.5.11'