add API only for decode parser for HW decoding support
Merge pull request #1399 from huili2/ParseOnlyAPI

add API only for decode parser
    add checking of frame rate and temporal layer setting for encoder input param
Reviewed at https://rbcommons.com/s/OpenH264/r/836/
Merge pull request #1403 from sijchen/fr_setting_fix1

[Encoder] Add checking of frame rate and temporal layer setting
Merge remote-tracking branch 'upstream/master' into travis.osx