overhaul the table styles and update those everywhere in the docs, update the button docs, spec out the forms docs

docs/scaffolding.html

@@ -161,7 +161,7 @@
   </div>
 
   <h2>Grid customization</h2>
-  <table class="zebra-striped">
+  <table class="striped-table">
     <thead>
       <tr>
         <th>Variable</th>
@@ -273,7 +273,7 @@
     <div class="span8">
       <h2>Supported devices</h2>
       <p>Bootstrap supports a handful of media queries to help make your projects more appropriate on different devices and screen resolutions. Here's what's included:</p>
-      <table class="zebra-striped">
+      <table class="striped-table">
         <thead>
           <tr>
             <th>Label</th>