Update normalize.css from master branch

Author: necolas

normalize.css

@@ -1,4 +1,4 @@
-/*! normalize.css 2012-03-06T10:21 UTC - http://github.com/necolas/normalize.css */
+/*! normalize.css 2012-03-09T22:11 UTC - http://github.com/necolas/normalize.css */
 
 /* =============================================================================
    HTML5 display definitions
@@ -489,6 +489,22 @@ textarea {
     vertical-align: top; /* 2 */
 }
 
+/*
+ * Addresses placeholder color unset in Firefox
+ */
+
+:-moz-placeholder {
+    color: #a9a9a9;
+}
+
+/*
+ * Addresses placeholder text remaining visible on focus in Chrome
+ */
+
+:focus::-webkit-input-placeholder {
+    color: transparent;
+}
+
 
 /* =============================================================================
    Tables