0.12.4

• [Feature] Fuction Defines - allows to do custom metric aliases (thx to @lomik). See doc/configuration.md for config format
• [Improvement] New config options that allows to prefix all URLs and to enable /debug/vars on a separate address:port. See docs/configuration.md for more information
• [Improvement] /render queries now returns tags in json (as graphite-web do)
• [Improvement] groupByTags should now support all available aggregation functions (#410)
• [Fix] Fix panic when using carbonapi_proto_v3 and doing tag-related queries (#407)
• [Fix] Add missing alias for averageSeries (thx to @msaf1980)