v2.4.0

• New internal event based architecture to easily extend proxy features.
• Added HTTP API.
• Added per worker statistics, available in HTTP API and terminal.
• Added command line option --no-workers and config option workers.
• Added option access-log-file, to write to file log information about connection/disconnection of miners.
• Added limited support to override pool diff, global via option custom-diff or per worker WORKER_ID+DIFF.
• Added option coin, set it to aeon if use proxy for AEON (cryptonight-lite).
• Added donation, default 2% configurable down to 1% as promised before, no fee if you use only one pool connection (up to 256 workers).
• #19 Use ratio instead of efficiency in connections report.
• Optimized performance, stability and memory usage.
• libjansson replaced to rapidjson.