fix button styles on active and disabled

docs/assets/css/bootstrap.css

@@ -1700,7 +1700,7 @@ table .span12 {
   outline: 5px auto -webkit-focus-ring-color;
   outline-offset: -2px;
 }
-.btn-active, .btn:active {
+.btn.active, .btn:active {
   background-image: none;
   -webkit-box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15), 0 1px 2px rgba(0, 0, 0, 0.05);
   -moz-box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15), 0 1px 2px rgba(0, 0, 0, 0.05);
@@ -1710,7 +1710,7 @@ table .span12 {
   color: rgba(0, 0, 0, 0.5);
   outline: 0;
 }
-.btn-disabled, .btn[disabled] {
+.btn.disabled, .btn[disabled] {
   cursor: default;
   background-image: none;
   background-color: #e6e6e6;

less/buttons.less

@@ -44,7 +44,7 @@
 }
 
 // Active state
-.btn-active,
+.btn.active,
 .btn:active {
   background-image: none;
   @shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
@@ -56,7 +56,7 @@
 }
 
 // Disabled state
-.btn-disabled,
+.btn.disabled,
 .btn[disabled] {
   cursor: default;
   background-image: none;