add ARM32/64 Unit Test for Expand Picture
    cleanup trace module
    clean build warning related encoder
Merge pull request #937 from ruil2/enc_warnings_1

    clean build warning related encoder
Merge pull request #936 from ruil2/trace_cleanup

    cleanup trace module
Merge pull request #938 from dongzha/AddArm64UnitTestEP

add ARM32/64 Unit Test for Expand Picture
Merge remote-tracking branch 'upstream/master' into travis.osx