diff --git a/docs/css.html b/docs/css.html
index 7826742e86..e87abfbc0d 100644
--- a/docs/css.html
+++ b/docs/css.html
@@ -1456,19 +1456,19 @@ For example, <code>&lt;section&gt;</code> should be wrapped as inline.
     <p>Validation styles are applied on a per-input basis. With horizontal forms, the <code>&lt;label class="control-label"&gt;</code> will always be styled.</p>
 
     <form class="bs-example form-horizontal">
-      <div class="control-group has-warning">
+      <div class="has-warning">
         <label class="control-label" for="inputWarning">Input with warning</label>
         <div class="controls">
           <input type="text" class="input-with-feedback" id="inputWarning">
         </div>
       </div>
-      <div class="control-group has-error">
+      <div class="has-error">
         <label class="control-label" for="inputError">Input with error</label>
         <div class="controls">
           <input type="text" class="input-with-feedback" id="inputError">
         </div>
       </div>
-      <div class="control-group has-success">
+      <div class="has-success">
         <label class="control-label" for="inputSuccess">Input with success</label>
         <div class="controls">
           <input type="text" class="input-with-feedback" id="inputSuccess">
@@ -1476,19 +1476,19 @@ For example, <code>&lt;section&gt;</code> should be wrapped as inline.
       </div>
     </form>
 {% highlight html %}
-<div class="control-group has-warning">
+<div class="has-warning">
   <label class="control-label" for="inputWarning">Input with warning</label>
   <div class="controls">
     <input type="text" class="input-with-feedback" id="inputWarning">
   </div>
 </div>
-<div class="control-group has-error">
+<div class="has-error">
   <label class="control-label" for="inputError">Input with error</label>
   <div class="controls">
     <input type="text" class="input-with-feedback" id="inputError">
   </div>
 </div>
-<div class="control-group has-success">
+<div class="has-success">
   <label class="control-label" for="inputSuccess">Input with success</label>
   <div class="controls">
     <input type="text" class="input-with-feedback" id="inputSuccess">
diff --git a/docs/customize.html b/docs/customize.html
index b54b70fc30..7d2b4f2540 100644
--- a/docs/customize.html
+++ b/docs/customize.html
@@ -398,9 +398,20 @@ lead: Customize Bootstrap's components, LESS variables, and jQuery plugins to ge
           <label>@line-height-base</label>
           <input type="text" placeholder="1.428571429">
           <p class="help-block">Used to calculate line-height throughout Bootstrap.</p>
+        </div>
+      </div>
+
+      <h4>Headings</h4>
+      <div class="row">
+        <div class="col-lg-6">
+          <label>@headings-font-family</label>
+          <input type="text" placeholder="@font-family-base">
+          <p class="help-block">Choose a separate font-family for headings.</p>
           <label>@headings-font-weight</label>
           <input type="text" placeholder="500">
           <p class="help-block">Choose a separate font-weight for headings.</p>
+        </div>
+        <div class="col-lg-6">
           <label>@headings-line-height</label>
           <input type="text" placeholder="1.1">
           <p class="help-block">Choose a separate line-height for headings.</p>
@@ -458,6 +469,24 @@ lead: Customize Bootstrap's components, LESS variables, and jQuery plugins to ge
         </div>
       </div>
 
+      <h3>Container sizes</h3>
+      <p>Define the maximum width of <code>.container</code> for different screen sizes.</p>
+      <div class="row">
+        <div class="col-lg-6">
+          <label>@container-tablet</label>
+          <input type="text" placeholder="728px">
+          <p class="help-block">For <code>@screen-small</code> and up.</p>
+          <label>@container-desktop</label>
+          <input type="text" placeholder="940px">
+          <p class="help-block">For <code>@screen-medium</code> and up.</p>
+        </div>
+        <div class="col-lg-6">
+          <label>@container-large-desktop</label>
+          <input type="text" placeholder="1170px">
+          <p class="help-block">For <code>@screen-large</code> and up.</p>
+        </div>
+      </div>
+
       <h3>Grid system</h3>
       <p>Define your custom responsive grid.</p>
       <div class="row">
@@ -522,7 +551,7 @@ lead: Customize Bootstrap's components, LESS variables, and jQuery plugins to ge
           <label>@btn-default-color</label>
           <input type="text" placeholder="#fff">
           <label>@btn-default-bg</label>
-          <input type="text" placeholder="#a7a99aa">
+          <input type="text" placeholder="#474949">
           <label>@btn-default-border</label>
           <input type="text" placeholder="@btn-default-bg">
           <h4>Primary</h4>
diff --git a/less/forms.less b/less/forms.less
index 2389036daf..add42ee9f8 100644
--- a/less/forms.less
+++ b/less/forms.less
@@ -437,7 +437,7 @@ input[type="color"] {
 }
 
 // Only right align form labels here when the columns stop stacking
-@media (min-width: 768px) {
+@media (min-width: @screen-tablet) {
   .form-horizontal .control-label {
     text-align: right;
   }
diff --git a/less/mixins.less b/less/mixins.less
index 6d39d2aaeb..e5643721d7 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -331,7 +331,7 @@
 // --------------------------------------------------
 
 // Short retina mixin for setting background-image and -size
-.retina-image(@file-1x, @file-2x, @width-1x, @height-1x) {
+.img-retina(@file-1x, @file-2x, @width-1x, @height-1x) {
   background-image: url("@{file-1x}");
 
   @media