Update rebar.config

* Added rebar erlydtl_opts to enable debug_info compile option
  for the ErlyDTL .dtl templates
  See <https://github.com/rebar/rebar/issues/49#issuecomment-13310351>
  by @kellymclaughlin

rebar.config

@@ -8,6 +8,10 @@
 
 {erl_opts, [debug_info, fail_on_warning]}.
 
+{erlydtl_opts, [
+	       {compiler_options, [report, return, debug_info]}
+	       ]}.
+
 {deps, [
        {lager_syslog, ".*", {git, "git://github.com/basho/lager_syslog", {tag, "1.2.2"}}},
        {cluster_info, ".*", {git, "git://github.com/basho/cluster_info", {branch, "master"}}},