- #136 when we are streaming live and not in dvr mode set the duration to zero in the overridden index handler instead of the metadata callback. dvr mode will have metadata with a duration.

- fixes for osmf class in f4m plugin

- Refactored changes with dynamic stream switching features for rtmp and httpstreaming. Switching rules and metrics differ between them. New code requires to be compiled against OSMF 2.0
- Updated versions for f4m and httpstreaming which also require OSMF 2.0.

#27 regression caused by #550, only stop the player for live streams. caused issues when stopping between playlist items.