fix bug: invalid socket len

fix crash in broadcast

fix http-flv: error tag while has no audio track

fix bug: error nmsg

add update for metadta notify

delete invalid log

update dockerfile

Problem installing on Ubuntu 18.04 #61 closed

ignore_invalid_notify off

donot write when http client closed

fix bug: crash when notify addr is invalid

1.fix extend timestamp when using librtmp; 2.add rpm packet script;

ignore relay or interprocess session when getting stat

fix status format

add ngx_live_stat json format for live stat