Add test for colorConversion
Add test for color conversion
Add test for valueEncoding
Add test for valueDecoding
Change some code for valueEncoding
Add test for writeStuffedByte and readStuffedByte
Changed valueEncoding to accept symbol only and return category and symbol
Changed valueDecoding to accept category and symbol(in uint32) and return symbol
Merge https://github.com/soofatt/ImageCompressor