properly apply site wrap classes to style wide version

fixes #12

incorporealcms/templates/base-wide.html

@@ -1,2 +1,2 @@
 {% extends "base.html" %}
-{% block site_class %}class="wide-site-wrap"{% endblock %}
+{% block site_class %}class="site-wrap site-wrap-double-width"{% endblock %}

incorporealcms/templates/base.html

@@ -10,7 +10,7 @@
 <link rel="stylesheet" href="{{ url_for('static', filename=user_style) }}">
 <link rel="icon" href="{% if config.FAVICON %}{{ config.FAVICON }}{% else %}{{ url_for('static', filename='img/favicon.png') }}{% endif %}">
 
-<div {% block site_class %}class="site-wrap"{% endblock %}>
+<div {% block site_class %}class="site-wrap site-wrap-normal-width"{% endblock %}>
     {% block header %}
     <div class="header">
         <div class="nav">