module should not export any symbols.
use prototype
write doc on jclass.
add lookahead_queue module.
wip
parse attribute (Code, ConstantValue, InnerClasses)
fix missing dependencies
fix error when Utf8_info.length is 0
can parse signature on attribute
can parse Exceptions, LocalVariableTable, LocalVariableTypeTable
trivial bug fix
can parse Deprecated attribute
can parse EnclosingMethod attribute
emulate bitwise operation when running under lua5.1 or luajit.
add profiler module.
add iterators utility.

for delay evaluation.
trivial bug fix on util.bitwise.band(...).
some changes.

1. remove youjo:filter()
1. remove youjo:find()
1. jclass's some functions return iterator function
support lua 5.1
bye bye youjo.

rename `util.youjo' to `util.utf8'