Check and Fix some issue#1535
1.doxgen documentation format for comments in api/*.h 2. comments to wiki tools in openh264/docs/*
Merge pull request #1544 from shihuade/master

1.doxgen documentation format for comments in api/*.h 2. comments to wik...
Merge pull request #1543 from dongzha/Fix1535

Check and Fix some issue #1535
Merge remote-tracking branch 'upstream/master' into travis.osx