Merge pull request #12 from KyOChiang/master

latest pull request
Add some test for baseline huffman encoding
Change data type representation in test code
Merge branch 'master' of https://github.com/soofatt/ImageCompressor
Add source n header file for HuffmanBinaryTree
Add a test for createNode for HuffmanBinaryTree
Changed some code
Add test for CodeTable. Not complete
Add test for Code Table
Add test for create code table of DC luminance
Add predetermined huffman tables for AC
Added test for CodeTable to create AC Luminance table
Add test for huffman decode. Not yet finished.
Add test for huffmanDecode
Add test for DC chrominance decode
Add test for DC chrominance, AC chrominance & luminance decode
Merge https://github.com/soofatt/ImageCompressor