changed signature of BunType::accept(node)
Main.java support file mode
adding upcast
Merge pull request #8 from imasahiro/support_file_loading

Support file mode
updating BunType
Merge branch 'master' of github.com:libbun/libbun2
bugs fixed at konoha.peg
bugs fixed at minic.peg
Merge branch 'master' into jvm-drv
add opcode enum