Add style-flat base

To create a modal with the flat style, just use modal-base-flat instead of modal-base

app/styles/common/common.sass

@@ -20,7 +20,7 @@ iframe
 .selectable
   cursor: pointer
 
-.modal-dialog
+.modal-dialog.game
   padding: 5px
   margin-top: 30px
   margin-bottom: 0px

app/templates/core/modal-base-flat.jade

@@ -0,0 +1,32 @@
+.modal-dialog
+  .modal-content.style-flat
+    block modal-header
+      .modal-header
+        if view.closeButton
+          .button.close(type="button", data-dismiss="modal", aria-hidden="true") ×
+        block modal-header-content
+          if view.options.headerContent
+            h3!= view.options.headerContent
+          else
+            h3 man bites God
+
+    block modal-body
+      .modal-body
+        block modal-body-content
+          if view.options.bodyContent
+            div!= view.options.bodyContent
+          else
+            p Man Bites God are the bad boys of the Melbourne live music and comedy scene. It is like being drowned in a bathtub of harmony.
+            img(src="http://www.manbitesgod.com/images/picturecoupleb.jpg")
+            img(src="http://www.manbitesgod.com/images/manrantb.jpg")
+
+      .modal-body.wait.secret
+        block modal-body-wait-content
+          h3 Reticulating Splines...
+        .progress.progress-striped.active
+          .progress-bar
+
+    block modal-footer
+      .modal-footer
+        block modal-footer-content
+          button.btn.btn-primary(type="button", data-dismiss="modal", aria-hidden="true", data-i18n="modal.okay") Okay

app/templates/core/modal-base.jade

@@ -1,4 +1,4 @@
-.modal-dialog
+.modal-dialog.game
   .background-wrapper
     .modal-content
       block modal-header