*really* refactor the buttons and update them all over the docs

docs/download.html

@@ -91,7 +91,7 @@
 
 <section class="download" id="components">
   <div class="page-header">
-    <a class="btn small pull-right toggle-all" href="#">Toggle all</a>
+    <a class="btn btn-small pull-right toggle-all" href="#">Toggle all</a>
     <h1>
       1. Chose components
       <small>Get just the CSS you need</small>
@@ -147,7 +147,7 @@
 
 <section class="download" id="plugins">
   <div class="page-header">
-    <a class="btn small pull-right toggle-all" href="#">Toggle all</a>
+    <a class="btn btn-small pull-right toggle-all" href="#">Toggle all</a>
     <h1>
       2. Select jQuery plugins
       <small>Quickly add only the necessary javascript</small>
@@ -216,7 +216,7 @@
 
 <section class="download" id="variables">
   <div class="page-header">
-    <a class="btn small pull-right toggle-all" href="#">Reset to defaults</a>
+    <a class="btn btn-small pull-right toggle-all" href="#">Reset to defaults</a>
     <h1>
       3. Customize variables
       <small>Optionally modify Bootstrap without a compiler</small>
@@ -315,7 +315,7 @@
     </h1>
   </div>
   <div class="download-btn">
-    <a class="btn xlarge primary" href="#">Customize and Download</a>
+    <a class="btn btn-primary" href="#">Customize and Download</a>
     <h4>What's included?</h4>
     <p>Downloads include compiled CSS, compiled and minified CSS, and compiled jQuery plugins, all nicely packed up into a zipball for your convenience.</p>
   </div>