Improve channel, user and api_key models with basic scopes, correct references and protect attributes.

Simplify channels & user controllers and models, moving code to the models.
Remove catch-all route and ensure all actions are specified, fixing url paths.
Change clone to dup in feed_controller as using clone seems to affect the cloned object (problem only in ruby 1.9.3?)

app/views/charts/index.html.erb

@@ -1,4 +1,5 @@
-<%= javascript_include_tag 'rest' %>
+<script type="text/javascript" src="/javascripts/rest.js"></script>
+  
 
 <h2>
 	<%= link_to t(:channels), channels_path %> &raquo;