doesn't work :(
fix json_dumper and json_simple
bump luvit-stream version; also changed hwm to a value defined in luvit-stream

stream of streams with a lot of sub-streams works now :)
bump luvit-stream; all tests run now :)
Merge branch 'songgao/wip_same_runner_interface' into songgao/wip

Conflicts:
	init.lua
	lib/test.lua