give IE7 inline-block behavior for input-prepend/append

docs/assets/css/bootstrap.css

@@ -1116,6 +1116,10 @@ select:focus:required:invalid:focus {
 .form-inline .input-append,
 .form-horizontal .input-append {
   display: inline-block;
+  *display: inline;
+  /* IE7 inline-block hack */
+
+  *zoom: 1;
   margin-bottom: 0;
 }
 .form-search .hide,

less/forms.less

@@ -475,6 +475,7 @@ select:focus:required:invalid {
   .input-prepend,
   .input-append {
     display: inline-block;
+    .ie7-inline-block();
     margin-bottom: 0;
   }
   // Re-hide hidden elements due to specifity