app/views/layouts/_messages.html.erb
<% unless controller.controller_name == 'channels' || controller.controller_name == 'main' %>
<!-- Rails flash messages styled for Bootstrap -->
<% flash.each do |name, msg| %>
<% if msg.is_a?(String) %>
<div class="alert alert-<%=name == :notice ? "success" : "danger"%> fade in" >
<button class="close" data-dismiss="alert">×</button>
<%= msg %>
</div>
<% end %>
<% end %>
<% end %>