add FKNN

暫不放FRNN因為有先定義需要再確認
Merge branch 'master' of https://github.com/yunfuliu/pixkit
add FRNN FKNN

add FRNN FKNN
那個沒是我自己的東西~
Merge pull request #36 from Li-Ying/master

Add FKNN FRNN