Merge pull request #199 from felixonmars/dev

fix a potential use_after_free by felixonmars
fix some compile warnning

Signed-off-by: xiehuc <xiehuc@gmail.com>
update mjson

Signed-off-by: xiehuc <xiehuc@gmail.com>
delete old log before merge online online log

Signed-off-by: xiehuc <xiehuc@gmail.com>
color reverse

Signed-off-by: xiehuc <xiehuc@gmail.com>
rename hotfix label

Signed-off-by: xiehuc <xiehuc@gmail.com>
several initial values and ensure group