Adding initial version of the OAuth token authentication method. This adds basic OAuth support for registering apps, getting and revoking keys, etc... The tokens come with 6 separate permissions bits; read/write user preferences, write diaries, write API and read/write GPS traces. Needs more tests.

app/views/oauth_clients/index.html.erb

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+<div class="flash"><%= flash[:notice] %></div>
+<h1>OAuth Client Applications</h1>
+<% unless @tokens.empty? %>
+<p>The following tokens have been issued to applications in your name</p>
+<table>
+  <tr><th>Application</th><th>Issued</th><th>&nbsp;</th></tr>
+  <% @tokens.each do |token|%>
+    <% content_tag_for :tr, token do %>
+      <td><%= link_to token.client_application.name, token.client_application.url %></td>
+      <td><%= token.authorized_at %></td>
+      <td>
+	<% form_tag :controller => 'oauth', :action => 'revoke' do %>
+	<%= hidden_field_tag 'token', token.token %>
+	<%= submit_tag "Revoke!" %>
+	<% end %>
+      </td>
+    <% end %>
+  <% end %>	
+</table>
+<% end %>
+<h3>Application Developers</h3>
+<% if @client_applications.empty? %>
+	<p>
+		Do you have an application you would like to register for use with us using the <a href="http://oauth.net">OAuth</a> standard?
+	</p>
+	<p>
+		You must register your web application before it can make OAuth requests to this service
+	</p>
+<% else %>
+	<p>
+		You have the following client applications registered:
+	</p>
+	<% @client_applications.each do |client|%>
+		<% div_for client do %>
+			<%= link_to client.name, :action => :show, :id => client.id %>
+		<% end %>
+	<% end %>
+<% end %>
+<h3><%= link_to "Register your application", :action => :new %></h3>