add a stats endpoint

lib/travis/api/app/endpoint/stats.rb

@@ -0,0 +1,18 @@
+require 'travis/api/app'
+
+class Travis::Api::App
+  class Endpoint
+    # TODO: Add documentation.
+    class Stats < Endpoint
+      # TODO: Add documentation.
+      get('/repos') do
+        { :stats => Travis::Stats.daily_repository_counts }
+      end
+
+      # TODO: Add documentation.
+      get('/tests') do
+        { :stats => Travis::Stats.daily_tests_counts }
+      end
+    end
+  end
+end