video-coder tests

codec's nitrate fluctuates around startBitrate parameter, which was
previously low and this caused high frame dropping. usually it should
be 2 times less than maxBitrate.
ref #1097 in progress
ref #1097, ref #1112, ref #1103

- "Jumping" jitter buffer
- Large jitter buffer
- Adaptive media playback
- Fixes for adaptive media playback
'issues/1097-adaptive-media-playback' -> 'dev'
1st step of transferring for TLV support

- removed dependency on FinalBlockID. now number of total segments per
each frame is appended as the last component.
- links against new TLV-supported ndn-cpp library
TLV-transfer step 2

- use TLV-enabled library
'issues/1221-tlv-transfer' into 'dev'
AMP bugfixes for video

- fixed AMP for video receiver
bugfixes

- fixed audio jitter buffer draining (allowed RTCP packets playout)
- added statistics output for audio channel
- playout buffer now skips late frames (doesn't wait for them)
- added synchronized rebuffing for audio/video receivers
- code cleanup
[untracked] bugfixes

- moved rebuffing synchronization logic into AVSyncrhonizer
- rebuffer every time if audio/video drift becomes greater than a
jitter buffer
- changed gop size (equals FPS now, not 2*FPS as was previously)
'demo-02-06' -> 'dev'