get mv and mvd from level limitation
Merge pull request #1304 from ruil2/mv_get_fix

    get mv and mvd from level limitation
update the number of reference when ltr changes
Merge pull request #1305 from ruil2/ltr_update_1

update the number of reference when ltr changes
Add UT for VaaCalc Functions.
remove "\n" which shoudl be added by the trace sink
Merge pull request #1307 from ruil2/trace_update

remove "\n" which shoudl be added by the trace sink
Merge pull request #1306 from zhilwang/vaa-ut

Add UT for VaaCalc Functions.
Add UT for Downsample functions.
add crop output for encoder
    add warning trace
Merge pull request #1308 from dongzha/ModifyEncOutput

add crop output for encoder
Merge pull request #1309 from zhilwang/downsample-ut

Add UT for Downsample functions.
Merge pull request #1310 from ruil2/trace_update_1

add warning trace
Merge remote-tracking branch 'upstream/master' into travis.osx