Update gruntfile to point to new customizer nav, run grunt

Gruntfile.js

@@ -337,7 +337,7 @@ module.exports = function (grunt) {
         },
         files: {
           'docs/_includes/customizer-variables.html': 'docs/jade/customizer-variables.jade',
-          'docs/_includes/nav-customize.html': 'docs/jade/customizer-nav.jade'
+          'docs/_includes/nav/customize.html': 'docs/jade/customizer-nav.jade'
         }
       }
     },

dist/js/bootstrap.js

@@ -1894,8 +1894,6 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
     var offsetTop    = offset.top
     var offsetBottom = offset.bottom
 
-    if (this.affixed == 'top') position.top += scrollTop
-
     if (typeof offset != 'object')         offsetBottom = offsetTop = offset
     if (typeof offsetTop == 'function')    offsetTop    = offset.top(this.$element)
     if (typeof offsetBottom == 'function') offsetBottom = offset.bottom(this.$element)
@@ -1923,7 +1921,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
       .trigger($.Event(affixType.replace('affix', 'affixed')))
 
     if (affix == 'bottom') {
-      this.$element.offset({ top: scrollHeight - offsetBottom - this.$element.height() })
+      this.$element.offset({ top: position.top })
     }
   }