Fix build instructions on README.md

http ssl module must be enabled
Update README.md

Remove additional build instructions for HLS since it is now included in rtmp module and does not need ffmpeg libs for compilation.
fixed typo
fixed crash on hls audio buffer overflow
Merge pull request #180 from jbochi/master

Fix build documentation
Merge branch 'master' of github.com:arut/nginx-rtmp-module
added ssl module note