胡斌 / srs

2.add forward_server_srs,true or false,default true,directive in config file in vhost section
to disable connect app req params to make connect app success when connect some cdn server

git version string example:2.0+ r3504M 6bf24238 2017-02-28 19:10:44
which means: branch , revison index, commit hash, date time

…ONTINUITY" at the head of total.m3u8

fix  Repeated release

2.erase the title "no desc" in m3u8 to reduce size because the title is optional

this feature is missed when merge the modification about "implement save meta,need more test"

Conflicts:

	trunk/src/app/srs_app_source.cpp
	trunk/src/app/srs_app_source.hpp
	trunk/src/protocol/srs_rtmp_stack.cpp