put jobs service back in

lib/travis/api/v3/services.rb

@@ -10,6 +10,7 @@ module Travis::API::V3
     Build         = Module.new { extend Services }
     Builds        = Module.new { extend Services }
     Job           = Module.new { extend Services }
+    Jobs          = Module.new { extend Services }
     Organization  = Module.new { extend Services }
     Organizations = Module.new { extend Services }
     Owner         = Module.new { extend Services }