accounts-ui: Show spinner while user document is loading

packages/accounts-ui/login_buttons.css

@@ -5,6 +5,122 @@
     font-family: 'Helvetica Neue', Helvetica, Arial, default;
 }
 
+#login-buttons .loading {
+    width: 24px;
+    height: 24px;
+    background-image: url(data:image/gif;base64,
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+}
+
 #login-buttons .login-button {
     float:left;
     cursor: pointer;

packages/accounts-ui/login_buttons.html

@@ -1,7 +1,13 @@
 <template name="loginButtons">
   <div id="login-buttons">
     {{#if currentUser}}
-      <div class="login-header">{{currentUser.name}}</div>
+      <div class="login-header">
+        {{#if currentUser.loading}}
+        <div class="loading"></div>
+        {{else}}
+        {{currentUser.name}}
+        {{/if}}
+      </div>
       <div class="login-button" id="login-buttons-logout">Logout</div>
     {{else}}
       {{#if services}}

packages/accounts/accounts_client.js

@@ -10,7 +10,7 @@
         // If the login method completes but new subcriptions haven't
         // yet been sent down to the client, this is the best we can
         // do
-        return {_id: userId};
+        return {_id: userId, loading: true};
       }
     } else {
       return null;