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

less/button-groups.less

@@ -130,10 +130,10 @@
 
 
 // Account for other colors
-.primary,
-.danger,
-.info,
-.success {
+.btn-primary,
+.btn-danger,
+.btn-info,
+.btn-success {
   .caret {
     border-top-color: @white;
     .opacity(75);
@@ -141,7 +141,7 @@
 }
 
 // Small button dropdowns
-.btn.small .caret {
+.btn-small .caret {
   margin-top: 4px;
 }