add some parameter settings in command line
    add the maximum nal size setting in command line
fix input source width and height setting issue
Merge pull request #814 from ruil2/enc_nalsize

    add the maximum nal size setting in command line
Merge pull request #815 from ruil2/enc_threadIdc

add some parameter settings in command line
Merge pull request #816 from ruil2/enc_scale

fix input source width and height setting issue
Merge remote-tracking branch 'upstream/master' into travis.osx