modify dec API from void to explicit type, and some comments
remove some warings
resolve unit test warnings
Merge pull request #885 from ruil2/enc_quant_v1.0

remove some warnings
Merge pull request #883 from huili2/API_dec_modify_v1

Api dec modify v1
Merge branch 'openh264v1.0' of github.com:cisco/openh264