Run `grunt`.

docs/dist/js/bootstrap.js

@@ -544,7 +544,8 @@ if (typeof jQuery === 'undefined') {
   var Collapse = function (element, options) {
     this.$element      = $(element)
     this.options       = $.extend({}, Collapse.DEFAULTS, options)
-    this.$trigger      = $(this.options.trigger).filter('[href="#' + element.id + '"], [data-target="#' + element.id + '"]')
+    this.$trigger      = $('[data-toggle="collapse"][href="#' + element.id + '"],' +
+                           '[data-toggle="collapse"][data-target="#' + element.id + '"]')
     this.transitioning = null
 
     if (this.options.parent) {
@@ -561,8 +562,7 @@ if (typeof jQuery === 'undefined') {
   Collapse.TRANSITION_DURATION = 350
 
   Collapse.DEFAULTS = {
-    toggle: true,
-    trigger: '[data-toggle="collapse"]'
+    toggle: true
   }
 
   Collapse.prototype.dimension = function () {
@@ -731,7 +731,7 @@ if (typeof jQuery === 'undefined') {
 
     var $target = getTargetFromTrigger($this)
     var data    = $target.data('bs.collapse')
-    var option  = data ? 'toggle' : $.extend({}, $this.data(), { trigger: this })
+    var option  = data ? 'toggle' : $this.data()
 
     Plugin.call($target, option)
   })
@@ -1916,7 +1916,7 @@ if (typeof jQuery === 'undefined') {
     for (i = offsets.length; i--;) {
       activeTarget != targets[i]
         && scrollTop >= offsets[i]
-        && (!offsets[i + 1] || scrollTop <= offsets[i + 1])
+        && (offsets[i + 1] === undefined || scrollTop <= offsets[i + 1])
         && this.activate(targets[i])
     }
   }