Merge branch 'release/0.5.0' into develop
added: ls command to Makefile
added: classfile_definition.*, classfile_opcode.*
made: opcode.*
rename: classfile_* files, added: opcode functions
implemented: generate opcode methods
implemented: main generate method
implemented: emit attribute info
added: emit method, code, attribute... (cannot javap)
bugfix: can write utf8 info
implemented: code generate (remain: unsigned probrem)
RUNNABLE!!!!!!!!
updated: README.md
Merge branch 'release/1.0.0'