Merge remote-tracking branch 'upstream/master' into docs-improvements

Author: Florian Kissling

dist/css/select2.css

@@ -113,14 +113,14 @@
   filter: alpha(opacity=0); }
 
 .select2-hidden-accessible {
-  border: 0;
-  clip: rect(0 0 0 0);
-  height: 1px;
-  margin: -1px;
-  overflow: hidden;
-  padding: 0;
-  position: absolute;
-  width: 1px; }
+  border: 0 !important;
+  clip: rect(0 0 0 0) !important;
+  height: 1px !important;
+  margin: -1px !important;
+  overflow: hidden !important;
+  padding: 0 !important;
+  position: absolute !important;
+  width: 1px !important; }
 
 .select2-container--default .select2-selection--single {
   background-color: #fff;