add folsom

rel/reltool.config

@@ -10,7 +10,7 @@
          mnesia,
 		 lager,
 		 compiler,
-		 %{folsom, load},
+		 {folsom, load},
          emqtt
         ]},
        {rel, "start_clean", "",
@@ -32,7 +32,7 @@
        {app, mnesia, [{incl_cond, include}]},
        {app, compiler, [{incl_cond, include}]},
        {app, lager, [{incl_cond, include}]},
-       %{app, folsom, [{incl_cond, include}]},
+       {app, folsom, [{incl_cond, include}]},
        {app, emqtt, [{mod_cond, app}, {incl_cond, include}]}
       ]}.