Edit ja/bytecode-compiler.markdown
Translate bytecode-compiler/encoder to Japanese
Translate bytecode-compiler/packager to Japanese
Translate bytecode-compiler/writer to Japanese
Translate bytecode-compiler/transformations to Japanese
Create ja/bytecode-compiler/customization
Edit doc/ja/index
Additional edits under doc/ja/bytecode-compiler
Merge pull request #28 from ocha-/doc2

The rest of japanese translation for the bytecode-compiler documents.