Add alerts for unconfirmed enterprises to overview page

app/assets/stylesheets/admin/alert.css.sass

@@ -0,0 +1,10 @@
+.alert
+  border: 3px solid #DA5354
+  border-radius: 6px
+  margin-bottom: 20px
+  color: #DA5354
+  padding: 5px 10px
+  h6
+    color: #DA5354
+  .message
+    font-weight: bold

app/views/spree/admin/overview/_unconfirmed.html.haml

@@ -0,0 +1,4 @@
+- @enterprises.unconfirmed.each do |enterprise|
+  .alert
+    %h6= "Action Required: Please confirm the email address for #{enterprise.name}."
+    %span.message= "We've sent a confirmation email to #{enterprise.email}, so please check there for further instructions. Thanks!"

app/views/spree/admin/overview/index.html.haml

@@ -1,17 +1,18 @@
 %h1{ :style => 'margin-bottom: 30px'} Dashboard
 
-- if @enterprises.empty?
+- if @enterprises.unconfirmed.any?
 
-  = render partial: "spree/admin/overview/enterprises"
+  = render partial: "spree/admin/overview/unconfirmed"
 
-- else
-  - if can? :admin, Spree::Product
-    = render partial: "spree/admin/overview/products"
+  %hr
 
-    %div.two.columns
-       
+- if can? :admin, Spree::Product
+  = render partial: "spree/admin/overview/products"
 
-  - if can? :admin, OrderCycle
-    = render partial: "spree/admin/overview/order_cycles"
+  %div.two.columns
+     
 
-  = render partial: "spree/admin/overview/enterprises"
+- if can? :admin, OrderCycle
+  = render partial: "spree/admin/overview/order_cycles"
+
+= render partial: "spree/admin/overview/enterprises"