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Fix bugs when using @DecodingIgnore & @EncodingIngore.

Fix bugs when using @DecodingIgnore & @EncodingIngore.

1. remove CodecUtils;
2. add DecodeUtils and EncodeUtils;
3. update README.md

1. add io package;
2. add api documents on method and class;
3. add unit tests of ascii array type;
4. fix the issue when decoding Calendar type.

1. remove fixed length annotation;
2. optimize code structure;
3. add skip method to Decoder and Encoder.

1. add benchmark of chain api;
2. update scala annotation;
3. fix bugs in Decoder and Encoder;
4. add some api doc.

1. add bool array type;
2. add new api which support working without annotations.

add EndianPolicy to array type.

1. fix bugs in mapper;
2. update documents.

1. update api, remove param of codec feature;
2. add unit tests of auto type.