refactor: move stream into io sub packagge.
refactor: move filters into "filters" sub packagge.
move encoding classes into "encodings" sub-package
move long packing class into "packers" sub-package
move packers
move static method classes into utils sub-package
move IntBitPacking class into packers sub-package
move LongBitPackingTest class into packers sub-package
move CodecUtils into utils sub-package
Merge pull request #9 from koron/refactor

Refactor