SB v0.5 released

1. Fixed some bug.
2. Update srs-librtmp from srs 2.0.

SB(SRS Bench) migrate to SRS ORG.

1. Rename ST-LOAD to SB(SRS Bench).
2. Migrate to SRS ORG.
3. Support OSX.

use srs-librtmp, support rtmp publish

1. use protocol sdk of srs-librtmp.
2. use flv api of srs-librtmp.
3. provides rtmp publish load.

substitute the rtmp protocol sdk

substitue the rtmp protocol sdk with high performance server srs protocol stack
srs(simple rtmp server) https://github.com/simple-rtmp-server/srs

basic load test for HTTP/HLS/RTMP

super load test tool for HTTP/HLS/RTMP.