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?)

lib/key_utilities.rb

@@ -0,0 +1,14 @@
+module KeyUtilities
+    
+  # generates a database unique api key
+  def generate_api_key(size = 16)
+    alphanumerics = ('0'..'9').to_a + ('A'..'Z').to_a
+    k = (0..size).map {alphanumerics[Kernel.rand(36)]}.join
+  
+    # if key exists in database, regenerate key
+    k = generate_api_key if ApiKey.find_by_api_key(k)
+  
+    # output the key
+    k
+  end
+end