Fix network buttons on protips

Task coderwall#128

Author: wesleylancel

app/views/protips/_protip.html.haml

@@ -38,7 +38,8 @@
               -slug = Network.slugify(name)
               %li{:style => "border-color:##{color_signature(slug)}"}
                 %a.name{:href => network_path(:id => slug)}= name
-                =link_to '', leave_network_path(:id => slug), :class => "follow #{slug}", :remote => true, :method => :post, :rel => "nofollow", :'data-follow-type' => 'Networks', :'data-value' => "#{slug}"
+                -followed = current_user.member_of?(Network.find_by_slug(slug))
+                =link_to '', followed ? leave_network_path(:id => slug) : join_network_path(:id => slug), :class => followed ? "follow followed #{slug}" : "follow #{slug}", :remote => true, :method => :post, :rel => "nofollow", :'data-follow-type' => 'Networks', :'data-value' => "#{slug}"
 
         -unless mode == 'preview'
           -if protip_owner?(protip, current_user) || is_admin?