enable ARM assembly for SampleSad16x16
remove double in SCC rc
refine common moudle for part of intra prediction function
Merge pull request #1385 from ruil2/function

enable ARM assembly for SampleSad16x16
Merge pull request #1387 from dongzha/MoveDoubleInSCCRC

remove double in SCC rc
Merge remote-tracking branch 'upstream/master' into travis.osx