fixing OverallMbMap for slice_idx>255 and some log improvements
use %lld instead of %8d for longlong type
update timestamp unit as millisecond
Merge pull request #1493 from ruil2/printf

use %lld instead of %8d for longlong type
Merge pull request #1490 from sijchen/after_review

[Encoder] Fixing for large number of slices
Merge remote-tracking branch 'upstream/master' into travis.osx