Consumer configuration

Configure consumers in erlang

Basic configuration

Consumers need to add configuration items to sys.config file dubboerl filed.

{dubboerl,[
	%% other config ...
	{consumer,[
		{<<"interface fullname">>,[Option]},
		%% eg:
		{<<"org.apache.dubbo.erlang.sample.service.facade.UserOperator">>,[]},
	]}
]}

Option is to be added.