Removing the placeholder text.

Since we are autofocusing input elements, it gives a poor user experience because the text flashes.

browserid/static/dialog/views/authenticate.ejs

@@ -23,7 +23,7 @@
 
                     <li class="section">
                         <label for="email" class="serif">Email</label>
-                        <input id="email" class="sans" placeholder="Your email" type="email" autocapitalize="off" autocorrect="off" autofocus required x-moz-errormessage="an email address is required">
+                        <input id="email" class="sans" type="email" autocapitalize="off" autocorrect="off" autofocus required x-moz-errormessage="an email address is required">
                     </li>
 
                     <li class="section">
@@ -33,7 +33,7 @@
                             <div class="half right">
                                 <a id="forgotpassword" class="forgot" href="#">forgot your password?</a>
                             </div>
-                            <input id="password" class="sans" placeholder="Your password" type="password">
+                            <input id="password" class="sans" type="password">
                         </div>
 
                         <div id="hint_section" class="start">