modify grammer rules related to Value
now compiler can handle binary operators
update character wordlist
implement parser that reflects the contents of wordlists
now parser supports simple line comments
make parser autoload wordlists for first_person and second_person
delete unnecessary wordlists
make parser autoload wordlists for {positive,negative}_{noun,adjective} and neutral_adjective
translate wordlists into Japanese
remove <> from Character grammer rule
make compiler return declared characters as well
make some grammer rules more flexible