Modify a bug which was not separate the key and value correctly, Add a new function called fill_hash used to deal with [key,value] pair, Modify value of UNKNOWN from 255 to -1, maybe need to modify the structure of feature_item because a key maybe have different values and the value maybe is a link to another key
Modify the op structure, modify the find_feature, is_op, split_kv function, insert the function to solve the value of a key is a name of another key
Merge branch 'master' into testing