[Encoder UT] add expGolom UT and encoder trace modification
Merge pull request #620 from JuannyWang/expNew

[Encoder UT] add expGolom UT and encoder trace modification
    add LTR mark
Merge pull request #622 from ruil2/dpb_ltr

add LTR processing in reference frame management
Merge remote-tracking branch 'upstream/master' into travis.osx