fix issue #348 -Compilation fails if repo is cloned with a different name

rebar.config

@@ -20,7 +20,8 @@
 
 %% plugins cannot find emqttd.hrl without ".." lib dirs:(
 %% but this setting will make deps apps collision
-{lib_dirs, ["../"]}.
+%% comment in 0.13.0 release
+%% {lib_dirs, ["../"]}.
 
 {sub_dirs, [
     "rel",