Implement support for some basic embed options for work sheets via LTI

This commit also fixes an issue with the flash messages being positioned too high and displayed for too long

app/views/application/_breadcrumbs.html.slim

@@ -1,19 +1,20 @@
 - if current_user.try(:internal_user?)
-  ul.breadcrumb
-    - if model = Kernel.const_get(controller_path.classify) rescue nil
-      - object = model.find_by(id: params[:id])
-      - if model.try(:nested_resource?)
-        li.breadcrumb-item = model.model_name.human(count: 2)
-        - if object
-          li.breadcrumb-item = object
-      - else
-        li.breadcrumb-item = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"))
-        - if object
-          li.breadcrumb-item = link_to(object, send(:"#{model.model_name.singular}_path", object))
-      li.breadcrumb-item.active
-        - if I18n.translation_present?("shared.#{params[:action]}")
-          = t("shared.#{params[:action]}")
+  .container
+    ul.breadcrumb
+      - if model = Kernel.const_get(controller_path.classify) rescue nil
+        - object = model.find_by(id: params[:id])
+        - if model.try(:nested_resource?)
+          li.breadcrumb-item = model.model_name.human(count: 2)
+          - if object
+            li.breadcrumb-item = object
         - else
-          = t("#{controller_name}.index.#{params[:action]}")
-    - else
-      li.breadcrumb-item.active = t("breadcrumbs.#{controller_name}.#{params[:action]}")
+          li.breadcrumb-item = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"))
+          - if object
+            li.breadcrumb-item = link_to(object, send(:"#{model.model_name.singular}_path", object))
+        li.breadcrumb-item.active
+          - if I18n.translation_present?("shared.#{params[:action]}")
+            = t("shared.#{params[:action]}")
+          - else
+            = t("#{controller_name}.index.#{params[:action]}")
+      - else
+        li.breadcrumb-item.active = t("breadcrumbs.#{controller_name}.#{params[:action]}")

app/views/application/_flash.html.slim

@@ -1,4 +1,4 @@
-#flash-container
+#flash-container.container
   #flash.container.fixed_error_messages data-message-failure=t('shared.message_failure')
     - %w[alert danger info notice success warning].each do |severity|
       div.alert.flash class="alert-#{{'alert' => 'warning', 'notice' => 'success'}.fetch(severity, severity)} alert-dismissible fade show"