add unsubscribe link to emails

app/views/map_mailer/access_request_email.html.erb

@@ -18,6 +18,9 @@
     <%= link_to 'Open in Metamaps', map_url(@map), target: "_blank", style: button_style %> 
 
     <p style="font-size: 12px;">Make sense with Metamaps</p>
+
+    <%= render partial: 'shared/mailer_unsubscribe_link' %>
   </div>
+
   </body>
 </html>

app/views/map_mailer/access_request_email.text.erb

@@ -7,4 +7,4 @@ Decline [<%= deny_access_map_url(id: @map.id, request_id: @request.id) %>]
 
 Make sense with Metamaps
 
-
+<%= render partial: 'shared/mailer_unsubscribe_link' %>

app/views/map_mailer/invite_to_edit_email.html.erb

@@ -17,6 +17,9 @@
     <%= link_to 'Open in Metamaps', map_url(@map), target: "_blank", style: button_style %>    
 
     <p style="font-size: 12px;">Make sense with Metamaps</p>
+
+    <%= render partial: 'shared/mailer_unsubscribe_link' %>
   </div>
+
   </body>
 </html>

app/views/map_mailer/invite_to_edit_email.text.erb

@@ -4,4 +4,4 @@
 
 Make sense with Metamaps
 
-
+<%= render partial: 'shared/mailer_unsubscribe_link' %>

app/views/shared/_mailer_unsubscribe_link.html.erb

@@ -0,0 +1,3 @@
+<div class="unsubscribe-link">
+  <%= link_to 'Click here to unsubscribe from all Metamaps emails', unsubscribe_notifications_url %>
+</div>

app/views/shared/_mailer_unsubscribe_link.text.erb

@@ -0,0 +1,5 @@
+
+
+You can unsubscribe from all Metamaps emails by visiting the following link:
+
+<%= unsubscribe_notifications_url %>