removed old row-fluid css selector from examples templates

examples/simple/templates/admin/index.html

 {% extends 'admin/master.html' %}
 {% block body %}
 {{ super() }}
-<div class="row-fluid">
-    <h1>Flask-Admin example</h1>
-    <p class="lead">
-        Simple admin views, not related to models.
-    </p>
-    <p>
-        This example shows how to add your own views to the admin interface. The views do not have to be associated
-        to any of your models, and you can fill them with whatever content you want.
-    </p>
-    <p>
-        By adding custom views to the admin interface, they become accessible through the <em>navbar</em> at the top.
-    </p>
-    <a class="btn btn-primary" href="/"><i class="icon-arrow-left icon-white"></i> Back</a>
+<div class="row col-md-10 col-md-offset-1">
+  <h1>Flask-Admin example</h1>
+  <p class="lead">
+  Simple admin views, not related to models.
+  </p>
+  <p>
+  This example shows how to add your own views to the admin interface. The views do not have to be associated
+  to any of your models, and you can fill them with whatever content you want.
+  </p>
+  <p>
+  By adding custom views to the admin interface, they become accessible through the <em>navbar</em> at the top.
+  </p>
+  <a class="btn btn-primary" href="/"><i class="icon-arrow-left icon-white"></i> Back</a>
 </div>
-{% endblock body %}
\ No newline at end of file
+{% endblock body %}

examples/sqla/templates/admin/index.html

 {% extends 'admin/master.html' %}
 {% block body %}
 {{ super() }}
-<div class="row-fluid">
+<div class="row col-md-10 col-md-offset-1">
     <h1>Flask-Admin example</h1>
     <p class="lead">
         Basic SQLAlchemy model views.
@@ -14,4 +14,4 @@
     </p>
     <a class="btn btn-primary" href="/"><i class="icon-arrow-left icon-white"></i> Back</a>
 </div>
-{% endblock body %}
\ No newline at end of file
+{% endblock body %}