Line trimming in README.md
Debugging is now controlled per context

Config property: "debug" = "<context(,s)>"
Contexts: all,generic,broker,topic,metadata,producer,queue,msg

Usage:
  rd_kafka_conf_set(&conf, "debug", "topic,producer,...", ..);
Moved topic.metadata.refresh.interval.ms to global (not producer-specific) config.
Proper broker metadata refresh on leader failure. (issue #14)

Config property:
Config property: "topic.metadata.refresh.fast.cnt" (def 10)
Config property: "topic.metadata.refresh.fast.interval.ms" (def 250ms)v
Some locking fixes
Metadata triggered debug messages should be in metadata context.